The fans (or at least this one) isn't thrilled with this because I'm a fan of the existing style and tone of the Archie comics (which I only just got into). I would guess most existing fans like Archie the way it is or they wouldn't be buying it. So I think its fair that such folks (the only existing fans) feel a little alienated by this. But if the existing style and tone don't bring in sufficient sales to keep the comic going, then of course I think most folks understand they need to try something new. My personal preference would have been for them to keep publishing Archie in the existing style and have the Waid/Staples be a new book altogether. Of course, they tried something like that a few years ago and it didn't work. If I recall, the art wasn't very attractive so perhaps it's not surprising.
I sort of think this is all a stunt to get them past issue 666 without having to have an issue 666. Or at least that's how they'll spin it if it fails and they need to revert to the classic style and numbering.