Hardly. He just to some extent accepted his place in the world. He realized that sometimes the hard choices have to be made for a better outcome, and those choices aren't always morally 100% justifiable.
In comparison to the One-Eyed King Kaneki, who tries too hard to be a bumbling good guy hero, Don Kaneki was far more realistic and mature in his mindset.
He wasn't perfect, but he should've evolved further from that point. Instead, he regressed, and that was not because there was no place with the character go, it was fully Ishida's fault that he regressed. There was plenty of room for him to grow in a good way, and to become more interesting.
In fact, I personally would have liked it if the Don Kaneki personality had been refined more, to the point that he would do anything to get the world he wanted, regardless of whoever reviled or loved him for it. This way, the CCG and Furuta could have been more intriguing too, as they wouldn't just be blindly Holocausting ghouls, it could instead have been a clash of ideals. Kaneki's ideal world vs Furuta's ideal world, and both would do their best to make their vision come true because they genuinely believed in it.
Not because Eto or Touka or Arima told Kaneki to, and not because Furuta just wanted to fuck around and create some chaos.
That way they could both be relateable yet at the same time appear to the other party as big boss bads, pic related.
But that's me. I'm nostalgic for the time when I still had the belief Kaneki would be taken in an interesting characters, as well as the conflict as a whole. Instead we got le zany memeclown clowning around, Kaneki being a moralfag and dropping his spaghetti around Touka, Eto giving up on life out of sheer "fucks not given", Tatara being fodderized and all other garbage in between.