Don't know. There are many female writers who are likely wanting to leave their mark in the comics industry. An Invisible Woman book could be a good foot in the door. The most well-known writers aren't the only option.
Plus all it takes is one writer to make a character really interesting and have other writers want to put their spin on them.
Also, being a fan of characters isn't necessary to have a great take on them. Hickman was unfamiliar with the FF when he first took over. But he ended producing one of the best runs on the team. I think a big part of that was because he wasn't beholden to certain prior runs like most writers on the FF are. A writer on Sue doesn't need to be a fan, their aim should be to create new ones which may include themselves.
Pretty much. Her role in the FF means that writers tend to put her in the "Mom" box and don't let her go beyond that. Like she should have more in common with her brother than blonde hair and blue eyes. Similar sense of humour, maybe similar temper etc. But the mother role doesn't let us see those sides to her.
I'm hoping that she is a member of another team and one with an interesting combination of characters, so that we can see other sides to Sue. It's sad that the only time she's on another team is when Marvel is doing their all-women team. That shouldn't be the only time she's on a different team.