The big thing is people are recognizing PAC is worth $30M per school at the high end. So, its a mismatch game.
Oregon and Washington are worth more than $30M I believe. And they will want unequal pay to reflect their higher value than say OrSt and WAst. But some schools won't want to participate in an uneqal model. So why not join the B12 where at least you will be paid equally and maybe even a little more than $30M.
So the inherent bickering inside the P12 I believe leads to its own undoing regardless of whether the B1G comes calling.