They also have boosters that could potentially cover it. It's all speculation, regardless.Air Force isn’t paying that amount of money to leave the MWC for that conference and PAC unlikely to cover additional exit fees (they are covering the 4 entirely under the rumored deal). Remember, Air Force still has government checks and balances.
Longer term - I believe they Air Force will probably be in a football conference with Army and Navy but will probably have its other sports in the MWC or some other regional conference.