Sorry Charlie, my post is huge once again. I've ramble on and on in order to explain why I feel what I feel, but it's very tl/dnr.
By conflict of interest I mean conflict of interest between those who love Jane in the Thor role, and those who love "classic" Thor (and by classic Thor I don't just mean Odinson, I mean the smart, resourceful, understands contemporary Earth society, fairly level-headed style Thor). I've said before that Jane as Thor and Odinson as Thor are not really compatible - I do not think the market will accept two Thor books when both characters are essentially the same. I think they tried it with Thunderstrike, and he simply didn't have enough of his own identity to make the book work, not when he had to compete with the original. At the moment Jane's Thor uses Mjolnir, which is important to her identity because it has a prestige, a weight of history behind it, and Jane wielding it rather than a new version gives her a certain credibility as Thor that she wouldn't have if she got a new hammer all her own; she has similar problems with the name, because "Thor" again has a prestige to it, and a new name might take decades to build up the kind of cache that "Thor" has; and she's not got a supporting cast of her own, nor an area of operations separate to Thor Odinson, as both Asgard and New York are where she's been operating just like Odinson traditionally does.
Now I'm going to stray into hypothetical territory in an effort to explain my point of view on the fan situation, so sorry if it is a bit long-winded:
imagine Jane coming back onto the scene under the pen of a new writer who, say, keeps her super-strong but gives her an adamantium mace instead of Mjolnir, gives her a new code-name, and makes her a "fun" supporting character for Thor, someone who blunders into trouble and needs to be rescued, someone who brings a certain comic-relief to things but isn't really half as a effective hero as Odinson is... that version of the character might be popular with some people. You might very well find that a bunch of people from this thread, people who are big Thor Odinson fans, absolutely embrace that version of the character and think it is far superior to her "Thor" identity. I would guess that in Jane's appreciation thread there would be a certain conflict between fans of Jane-as-Thor, and those Odinson fans who are now fans of the new Jane character, the one that doesn't compete with Thor for his identity. I imagine the fans of Jane's heroic "Thor" personality would complain that's she's not as good as she was, whilst the fans of the new Clumsy Jane would say she's a much better character like this, far more entertaining, far less cookie-cutter. Both sets of people are fans, but both relate to the character in a different way. One set see her as a reader-stand-in hero, the other set see her as a character first, hero second.
Fans of Jane as Thor will want to make a bit of noise about the fact that she's not being written the way they want and that Marvel aren't doing the character justice; fans of the new Jane identity will argue that the first group don't speak for all fans and that they have just as much a right to have a say on the direction of the character that they love, and of course it's true. But Jane-Thor fans are going to be particularly annoyed because Clumsy Jane's fans tend to be Odinson's fans, and they are getting their reader-stand-in hero in Odinson, whilst denying Jane-Thor fans theirs. They are going to see a conflict of interest where Clumsy Jane's fans are concerned, because as Jane fans they get to have a voice on the direction of the character, but they have a reason to not want the character to be written as heroic as they once were, and that is because they like Odinson as Thor more than Jane as Thor.
Basically I think comic-readers tend to have heroes that they closely identify with for whatever reason and want them to be their stand-ins or champions; and then they have other characters that they might like for slightly different reasons, characters that they see as characters first, heroes second. Most people on the forums set their favourite hero as their avatar. My 4 favourites these days are: Captain Mar-Vell, Captain Britain, Iron Fist, Thor. Years ago Rachel Summers would have been between Captain Britain and Iron First in my list. Back when Claremont was writing X-Men and she was a member she was my favourite X-Man by far, she just seemed so incredibly complex and fascinating, and all through her struggles when she was trying to process a lot of trauma and making bad decisions I rooted for her. Then Wolverine gutted her. I eagerly awaited for the Phoenix limited series that was promised... it never arrived. Then I heard she was going to be part of a team with Captain Britain and I thought all my Christmases had come at once.
Well, I hated Claremont's Excalibur. Captain Britain was portrayed as a cheating overprivileged buffoon, and Rachel stopped being complex and compelling - we barely got to hear her thoughts, and she didn't seem to have any internal conflicts. I slowly lost interest in the character. When I found CBR a few years ago I saw a Rachel Summers appreciation thread and started reading, expecting them to feel the same way I did about Rachel being a fantastic character in the Claremont/Romita JR years, and being turned into something of a dull, bimbo power-house in CC's Excalibur. I was completely wrong. Lots of people in the thread became fans of Rachel's during Excalibur, and many of them hated the earlier X-Men characterisation because she was always ****ing-up, getting lectured, talked down to and getting put in her place.
They related to her in a completely different way than I did. I think I was a teen when Rachel was in the X-Men, and she was one of the few comic-book characters I had a crush on. I guess I liked the flaws in her character, her emotional vulnerability, because I found they made her a more romantic character. I liked her as a character first, wish-fulfilment hero second. Looking at it now, of course a lot of Rachel's fanbase see Excalibur as the best Rachel has ever been written - yes she's got a lot less going on in her head on the page, but as a reader-stand-in hero she's a lot better than she was in X-Men; there she was the ****-up who did stupid things and everyone was angry with her, in Excalibur she's super-hot, lusted after both for her looks and her top-tier power, is referred to as the most important person in the omniverse, and kicks major tail in practically every issue.
I occasionally make the odd post in the Rachel Summers/Grey appreciation thread, but I'm not the same type of fan that they are. It's not that they are "real fans" and I'm a "faulty fan", but she's not really fulfilling the same type of role for me as she is for them.
I've also had some pretty big conflicts in Excalibur threads because Davis & Moore's Captain Britain is a super-hero I feel very personally attached to. My problem with Claremont's Excalibur is that it really strips away a lot of the positive aspects of Captain Britain until he is horribly flawed and humiliatingly ineffectual as a hero, but at the same time it removes many or all of the flaws of Kitty, Nightcrawler, and Rachel so they are operating at personal bests. For those three heroes you'll find their appreciation threads wishing writers would write them like they did in Excalibur, siting it as an example of really good writing that does all the characters justice. When I point out it completely screws Brian (and Meggan, but in a different way) in much the same way they complain more modern portrayals of Kitty, Nightcrawler, and Rachel do, they defend the writing to the hilt. Super-hero fans want that empowering, feel-good aspect of their heroes, but they also long for more realistic flawed characters in more emotionally complex storylines, and it often leads to one super-hero getting to be awesome whilst another stands there and face-plants repeatedly. It drives me nuts.