When I was a kid in the 80's, William Shatner's disposition toward Star Trek was more like disgust than anything. If he attended a conference at all, he was remarkably put-off. He seemed to hate the fact that he was seen more as Captain Kirk than any other character he played.
(The reason for that, by the way, is clear. Anyone can put themselves into Shatner's shoes and see how annoying it would be to have most of your work ignored.)
And, yet, it's not that way today. Not at all. William Shatner, today, seems to not only like Star Trek, but embrace his role as Captain Kirk. If you catch him at a conference, he's all about Star Trek and Captain Kirk - without any hesitation.
I know Shatner is getting old, and this might just be nostalgia or something, but was there something real that turned him from that hater to this lover? Don't get me wrong, I enjoy this Shatner most. And, clearly, by reading his memoirs, he doesn't seem to be kidding.