He'd be near 90 by the time the next Star Wars film after IX is ready. He may simply be getting older and needs a rest...he may even be contemplated retiring altogether after IX (assuming he makes it that far, which I hope he does). Not everything is a "liberal" plot, you know.
Williams has publicly stated that he loved the Rey character and that was one of the main aspects of the new trilogy that attracted him...unless he's not being honest and is just saying that to appease Disney. I seriously doubt it though. FWIW, I don't like the sequel trilogy at all, but I tend to take Williams at his word that he has no problem with the Rey character and actually is quite sympathetic to her. If he really hated the Rey character he would have quite any time, but he hasn't. It's not like he needs the money or has anything to prove to anyone at his stage in his career.
I never said he didn't like the character...i said it was the story that he didn't like...in particular her lack of a back story and origins...let me gt you a link...
None of his public statements indicate he has any problem with the films at all. If you have some basis for this claim I'd like to see it. Ceasing to compose Star Wars films is more likely to be a leading indicator of his retiring from composing for good. He's getting up there in age and wants to be at the top of his game health-wise to give his all for every movie. Only he's knows his reasons for this decision but health and energy levels are much more likely explanations - unless you have some compelling evidence to the contrary. Quite frankly, I don't see what Williams would see in the new films or Rey as a character that would inspire him artistically, but that's me.
As I said...a link for you;)
Now you may have a different take on it...but when I hear someone say they don't buy the way something was presented...it's criticism and not praise.
I had already seen this reported online and I didn't necessarily interpret this as a rejection of The Last Jedi, although it could be. My takeaway is that Williams was speculating on whether Kylo was telling the truth to Rey, much as there was speculation between 1980 and 1983 as to whether Darth Vader was actually Luke's father. Williams himself may not know yet whether this will turn out to be true, just as it is likely he didn't know if Vader was truly Luke's father or not until seeing a work print of Return of the Jedi. Obviously, he has a decided preference in the matter, but I don't know that this was the reason he chose not to do anymore. I would assume that Williams primary reasons for doing the new trilogy were out of loyalty to George Lucas himself and because he wanted to take advantage of the rare opportunity to develop musical motifs over a nine film saga. Since the personal influence of Lucas and Skywalker saga elements will no longer be there in whatever follows, he may have come to that decision anyway, no matter who Rey's parents turn out to be. I say "turn out to be" (as opposed to "turned out to be") because I'm not convinced this is the final word on Rey's history. I think Disney film may want to find some way to get themselves out of the corner they've painted themselves into and at least partially backtrack on this matter. Perhaps, Williams was trying to use his influence to put a little subtle pressure on Kathleen Kennedy and Co. to do just that. I'm afraid there's no hope for Snoke, though - he's dead and will stay dead. Anyway, I don't like the sequel trilogy even with Williams involved so it's kind of a moot point for me.
P.S. Sorry I didn't see the link initially. I'm used to the old IMDb discussion board format and didn't even notice it in your first message -something to do with the page layout, i guess