Rebooting the prequels is a very fanwanky thing to do, not Disney's job, and should indeed be left to fan edits or personal decisions of what is canon.
It's Disney's job to make a great sequel trilogy that makes up for the prequels, and makes Star Wars (when considering the entirety of it), into "two out of three ain't bad", instead of a minority of great movies sandwiched between 12 hours of bullshit.