Reality is only UO and UW are ones that even come close to that opportunity. Not saying they would be good, just saying they would be the only one's of those that left besides Stanford, not sure exactly why they took UCLA over Stanford but that is just me.
So the other members to get a decent TV deal have to offer more to those 2 schools for them to sign a GOR. Otherwise who wants to pay the PAC a bunch of money when the best teams might leave in a couple of years?