I'm saying this looks to be the best divisional makeup when UTEP's Conference USA and the Mountain West form an alliance in football.
Basically, the Mountain West accepts UTEP as a member — in all sports.
There could even be these subdivisions within the division to help ease travel costs. Remember, you have to pay to fly all sports teams, not just the football team and two basketball teams:
Note: If another school, or two, leave, here are some schools that could fill voids:
(New Mexico State, Utah State)
(UT San Antonio, Louisiana Tech)