As they say, loose lips sink ships.
This was true when the reporters tipped off the impending CSU/AFA defections...
And, it was also true when it was revealed that those schools desired to play Texas teams and the MWC was looking that way...
As with all realignment chatter, people will downplay interest as they see fit. However, it's widely accepted that the fatal flaw of Western based leagues is awful start times, which lead to innate disparities in exposure/bad bowl contracts/lower revenue.
That being said, IMO the mutual interest between Boise and the Big 12 made Texas expansion a pressing issue with the MWC.
The AAC's decision to remove that option from the big 'war board' has reset boundaries and walled off the MWC - not only from being able to expand in size when Boise leaves, but - from expanding their reach, both in terms of population and time offerings.
Craig Thompson is notoriously slow to press an advantage and this lack of aggression has left Colorado State and Air Force vulnerable - if indeed there is substance to the Big 12 rumors.
Because while both the MWC and AAC would both be in the crosshairs, only the AAC seriously has the capacity (and the heft) to absorb the hit - and adapt quickly. Navy's Western needs are taken care of, regardless; and (imo) Air Force's eastern needs will be met after the Big 12 expands.
Consequently, the AAC "Western Gambit" is in all actuality a few moves ahead in the sequence to be played.
If anyone wants to argue that UTEP and NMSU will satisfy the needs of Air Force and Colorado State, you're welcome to do so.
If anyone wants to talk about the appeal of certain additions, I'll posit that both leagues have memberships in flux right now and there is a greater vision that is playing out.
The key (at least for the American) right now is they have a media partner that is committed to seeing their conference succeed over the next decade; while the MWC is in dire straits if Boise State leaves at or before 2025 (as rumored). They simply have no way to recoup the hit just as their media deal runs out.
Now we all see why Colorado State and Air Force really wanted to leave. They know this is not over, and they don't have the security of a long term deal with a major network.