Yeah, what was he expecting? Did he really think Disney would go with his drafts after the intense fan backlash to the prequels? Disney wanted to distance themselves from the prequels as fast as possible, and the first step to doing that was rejecting Lucas’s drafts. Of course, now that the majority of the Star Wars fanbase has grown to appreciate the prequels, that decision has backfired horribly, but Disney had no way of seeing it back then.
That’s not even it. Regardless of what Disney did or didn’t want, it’s crazy to think that once they’d brought in a new filmmaker they wouldn’t give them free reign to use or not use Lucas’s ideas, and that that filmmaker wouldn’t decide to change things. Honestly it’s kind of just Lucas’s narcissism thinking that everyone would just blindly follow what he had laid out for them without having ideas of their own.
It’s only the rabid fans who think Lucas had a brilliant 9 episode saga written out since the dawn of the franchise, and Disney steered away from it. JJ and co. likely knew that Lucas probably shat out his treatments in a couple days before he handed them over.