Yeah it's definitely at the point now where I think Sue is better off elsewhere. The Fantastic Four book isn't the place to get the best Sue content and there are other writers and books that would actually utilize the character well.
My top choice is for her to have a solo of course but outside of that, she definitely needs leave the FF and to be put on another team for a few years. Just sub in someone else on the Fantastic Four while she's away like they've done before.