If they ever make another MMO I'd like an entirely new world. All the classics we know and enjoyed, ff7, 8, 9, 10, Ivalice and so on came into existence because they decided to create a new story, characters and world. I like a little fanservice here and there, and FF has plenty of little staples that are nice to see, but it'd be a shame if the future of FF is just reusing past glories.