I agree that this would resolve most of the issues people have with TLJ. And obviously it’s completely doable now thanks to AI. Although I do think his final line is a bit too hardcore.
I think the reason why they opted not to show what was going in Ben’s head/future was because then they’d be having a flash forward inside of a flashback. That would definitely get confusing. I wonder if this is doable with just purely the dialogue. Something like “Han and Leia would die because of what he would become”.