With all due respect to GSP and his fans, he does not deserve much better. In fact he has got much better than he deserved.
1) After a 4 year layoff, he is gifted a title shot at MW, a weight class he has never fought at and was not ranked at, against Bisping. A champion who while he earned his strap, was considered almost universally as a very week champ. I find it interesting that GSP had no such interest when Silva, or Weidman, or Rockhold, was champion. He got his 2 straps and he will go down as a 2 division champ, but GSP is the least legitimate of all the 2 division champs in this sherdoggers opinion.
2) He was given this completely unearned, undeserved title shot with the stipulation that he defend the belt should he win. He didn't. He backed out of that agreement. Wax whatever medical or health poetry around it that you want. He welched.
3) 2nd strap obtained and welching completed, he is now holding out for another completely unearned, undeserved title shot in a weight class he has never fought. I hope the UFC does not give it to him and I don't think they will. I don't think they will ever let GSP fight for a title again after what he pulled at MW. They know to near certainty that should he win that fight, he will just ride off into the sunset. He would leave yet another division, which was already in disarray, and put in additional disarray just to accommodate him, in complete fubar disarray by vacating immediately after winning.
The UFC does not need GSP to fight McGregor. Either of them will sell plenty of PPV's on their own against pretty much any opponent.
GSP has options. Since he never lost the belt at WW, he could get that shot. But he wants absolutely nothing to do with Woodley, and he won't want anything to do with anyone that beats Woodley.
If he wants to fight for the LW belt, let him go through a couple of the active killers sitting at the top of that division and earn the shot. Fergie will be healing up soon. Poirer and Lee will both be needing dance partners. Any of those are compelling. Let him go through 2 of those 3 and tidy things up at the top a bit.
Then if he earns a TS give it to him. And if he rides off into the sunset again, at least he will have added a little value to the division before doing so.