I am starting to think that Oregon and the 10-team Pac12 is going no where. The Big12 is your only realistic option and I think the Pac12 is fighting to keep members in along with the ACC who doesn't want to be passed up by the new Big12.
I am wondering who the Pac12 can pick up or if any addition can add value?
Two easy picks are UNLV to get Nevada and Las Vegas region and San Diego State to get back into Southern California. Both also fit in the Pac12 South to keep divisions.
However, neither adds that much value and I am not sure about their academics or how Cal/Stanford will view them.