But we’re assuming that he still hands over his control of Lucasfilm to Kathleen Kennedy.
I don’t think that would ever happen. Lucas sold Lucasfilm for the money. I think he’d hold onto his creation as a long as possible, unless Kennedy hands him a couple billion dollars.
But for the sake of the argument we will say she gets it and receives George’s blessing. I think she would more or less follow George’s wishes until his death. It’d a lot harder to blame a large corporation like Disney, but very easy to pick on one person. People do it with Kennedy already, but in this timeline she truly would be responsible for everything that happens.
A couple years after George’s death, she might announce a sequel trilogy but I don’t think she’d use his scripts. While we don’t know much about them, that everyone who read them didn’t use anything just proves to me their poor quality. So she’d hire new directors. A certain Star Trek director would’ve loved to make a star wars film would happily sign off even if at a slightly lower salary than one with Disney. And… not much would change. Although the sequels would probably be three years apart without an spinoffs.
None of this speculation makes any sense. Kennedy wouldn’t have taken over LFL if she wasn’t allowed to make films. By the time Lucas dies, she’ll probably be retiring herself. Not to mention, Lucas was planning on gearing up production on more SW films before he sold the franchise, so there’s no reason they’d have to wait until after his death (what?). Plus, the sequels have, in fact, used many elements of Lucas’s treatments.