His strikeout rate has actually increased as the year has gone on.
I'd keep reasonable, modest expectations for next year. For one thing, many pitchers are injury risks and a pitcher at his age is even more in danger. Second, yeah, he's managed to adapt himself and become a "new pitcher," but that's not to say that batters won't adjust or he won't slip into bad habits, or he won't become unluckier with a lower strikeout rate or a lot of other things that could go wrong. I think the thing that concerns me most is that he's managed to induce a much greater number of ground balls this season over his career norm, and that's certainly a positive development. However, if his home run rate regresses, he could be in trouble. He probably won't put too many batters on base because of walks, but he is hittable.