The Mountain West, for the time being, should not be considered just one half of the future MOUNT USA. As has been chronicled by Jon Wilner here and Brett McMurphy here, the MWC and Conference USA are no longer looking to make a whole new conference and are instead back to working on an alliance of sorts. The reason is money. The reason is always money.
This means MWC expansion is a thing, and Wilner reports the Utah St. Aggies and San Jose St. Spartans could be the leading candidates, with the league commish visiting both schools as of late. Pretty much no matter what happens, the WAC is sustaining another mighty blow and could soon put the NCAA in the tough spot of having to enforce FBS eligibility rules en masse.
McMurphy reports that if the two do end up making one new conference, it's likely to happen by early June.
For more on the Mountain West, visit Mountain West Connection.