How is Serra getting screwed, exactly? He wasn't stripped of his championship. He will be recognized as the true-blue Welterweight Champion until he returns. The winner of GSP/Hughes will only be known as an interim champion, and nothing more. Doesn't really sound like that raw a deal, does it? If anything, Serra is getting a sweet deal, because he gets to hang onto that belt for a few more months without defending it. Not too shabby.
And it's not like this move will result in Serra's being thrown to the wolves. He was slated to fight Hughes to begin with, and GSP was noted as saying that he wanted his rematch with Serra some day, so these were two names that Serra was going to meet up with, anyway. If Serra is as big and bad as he claims to be, then he will return, whoop some ass, and walk away the undisputed Welterweight Champion. So, how is this a raw deal?