If you don't believe BYU as an independent is a done -- and a lot of people don't -- consider another Mountain West option.
With BYU, the MWC is currently at 11 teams. There are still questions about whether financially and athletically (putting its minor sports in the West Coast Conference) BYU is viable as an independent. In that scenario, the MWC isn't going stay at 11. Hello, Houston, maybe Texas-El Paso from Conference USA which could make it a 12-team league with two six-team divisions. The drawback is, as usual, money. Current MWC members are making a paltry $1.5 million in television revenue. Conference USA makes about the same amount.
CUSA also has seven bowl tie-ins compared to five for the MWC. I know for a fact that UTEP doesn't want to lean West for its fans' sake. It likes being in the Mountain and Central time zone. Don't know about Houston.