Great discussion, but they're never, ever, ever going to reboot or ret-con the prequels.
Prequels feed into Clone Wars, which feeds into Rebels, which may feed into Rogue One, which feeds.... etc.
We can hardly take the moral high ground on here about film history and preservation and then propose rebooting the prequels.
As for what's next - the world really is their oyster and they can go anywhere! As long as, for me, it's universe expansion. I don't need a million origin stories. It's OKAY for Luke to meet Han in the Cantina without knowing Han's teenage years as a smuggler.
The possibilities are endless!
But we fight for the OOT.