I would kinda love saving Anakin from turnig to the dark side and letting him raise Luke and Leia in peace. I bet most fans wouldn't like such a thing, though.
I think that would at least be more interesting than just changing Palpatine's fall, but my trust in how Disney would handle the series even without time travel is not high.
I remember people were similarly upset with the prequels as well when George Lucas first made them. So I'm not sure that input from the man that decided to sell the franchise is necessarily going to improve much. If he cared half as much about the direction of the series as the fans do, I don't imagine he would have sold it.