Well there is always the WAC with CSUB & NMSU. lol
Seriously though where could they go, and what conference would take them. The two potentially best fits would be the Big East or the A-10, but that would put a footprint far to the west for them. Not sure either conference, and the membership would be willing to.
MVC has Wichita State in it, and Illinois State had a good year. UNI was down a bit this year - but that may be the closest footprint for them. And would that league be any better than the WCC? The American is a bit spread out already, and has schools in Texas. Would the Big 12 take a basketball only member? And of course the MWC.
IMO, if the Big 12 would take them - that's the league I would shoot for, otherwise the Big East is the next best option.