PAC 12. For example, super conferences form and the PAC 12 decides to add more members to its current 12. OR Big 10 or Big 12 poaches some of the PAC 12 schools who are disgruntled with the PAC 12 (see USC, etc) and the PAC 12 has to replace the departing schools.
I recognize the major obstacles BYU would have to overcome getting into the PAC 12 in any configuration. However, the west coast is and always will be the best fit for BYU and its alumni base.
There are a thousand possibilities as to how future conference realignment could shake out, so we will see I suppose. It could end up being a huge realignment, a small one, or maybe nothing at all if Texas and OU decide to stand pat as they have before in their various drama queen routines.
I HATE that I'm letting myself get sucked back into the realignment vortex. Ugh.