Okay, like a year ago it looked like no one was going to dethrone Anderson Silva, Jon Jones and Georges St. Pierre (even if you didn't like him.) That's not the case any more.
Silva got knocked out. People like me say that it was just because he was goofing off, but he still got knocked out. He's not the champion anymore. He's not getting any younger, either.
Then Jon Jones almost got tapped by Vitor Belfort. He blew through Chael, but then he had a controversial decision with a fighter who was given no chance against him; really just someone who had been considered a pretty good fighter, at best. A lot of people seem to believe Gussstthaphffsonniona won that fight.
And GSP has been ragdolled in his last three. His last fight...I think he might have technically won that one, but I also think he technically lost that one. D'ya know what I mean? He really got his butt kicked and he just barely squeaked by, and it would be absolutely acceptable to argue that Hendricks was the one who "barely squeaked by," though it really would have been a shame to award a title to someone who "barely squeaked by" a victory against a champion who has successfully defended the title against the best the UFC had to offer TEN times prior to this fight? I mean, come on...who the heck is Hendricks?
Cain still looks solid, though he couldn't seem to finish JDS in two outings (one sorta' expects a finish in the Heavyweight division,) despite getting knocked out the first time their paths crossed. And, the best in the Lightweight division has always been a crapshoot; they all seem to equally talented. The other weight classes don't matter. Sorry...they just don't.
The long-time stars don't seem so invincible, anymore (Maybe Jones isn't so "long-time," but he has held the title for 2 and ahalf years, which is a while.) That's a shame. As a boy growing up watching kung-fu movies, I like to think there's someone out there that's like a superhuman. It seemed as though these three stars had that going for them. I don't think they do, anymore.