Problem with the Summit is NDSU, SDSU, USD and Omaha are locks.
After that...
IUPUI and ipfw would jump to the Horizon in a heartbeat
Oral Roberts already left once
Western Illinois would jump to the Ohio Valley or MVC
Denver could jump to the Big Sky with New Mexico
If I was New Mexico State I would be looking to the Big Sky. Especially if they get Idaho.
I would target New Mexico State in a heartbeat