I think Oklahoma needs to let it go, and get on with their season, though I do feel sorry for them. Their season was single-handedly ruined by an abomination of a referee crew even after they watched the replays! And then they got the pass interference call wrong! I know that you can say that Oklahoma didn't get the job done, especially since they were still winning even when the bad calls were made, but that can only go so far.
That being said, they have a right to have that gripe and to want those officials out of a job, but to cancel their games against Pac-10 opponents is just nonsense.