The MAC needs to strike while hot..add Marshall again with Middle Tennessee and Old Dominion. In hoops add them all and go grab all D1 in state along with everyone bordering: Northern and Eastern Kentucky, Duquesne, Robby Mo, Detroit..etc.
What makes you think those schools would be interested? My guess is there will be no expansion. The MAC has been really conservative about that over the past 10 years.
You're probably right that the MAC will stand pat. It would likely take an existing program being forced to drop football to see any action towards attracting new members.
I also wonder how big of a sales pitch it is to recruits that they get to play most of their games in warmer climates with C-USA essentially being a Southern league. All but 3 teams are in a SEC state. Would you rather play a November road game in Boca Raton or Buffalo?
The one thing that comes to my mind would be a reduction in travel costs. However, it seems like most C-USA sports are played in the East and West Divisions so it would likely not be a major difference?