All depends on Oregon and Washington. They stay, they have a chance, they leave and it folds.
If Oregon and Washington decide to stay then the Big 12 should still put a lot of pressure on the AZ/CO/UT schools and see if they can get them to leave. That would destabilize the Pac-12 enough that Oregon and Washington would have to leave - and if the B1G is no longer interested then they'd have to come here.