I think it's complicated. Both schools would have to add a sport.. Montana a women's sport, MSU a men's sport (IIRC). Both would have to increase scholarships for football. I think the Montana BOR is somewhat resistant to increasing the athletic budget (both schools would also have to increase athletic fees). I think there's also a lot of complacency at both schools thinking that FCS is just fine for them.. when in reality, there are no good FCS schools left except in the Big Sky and Missouri Valley. That's why they're regulars in the FCS title games. I would assume for UM and MSU to move up the Mountain West (or whomever) would need to kick in money to both schools to offset that initial budget hit.
I saw a list yesterday or the day before of the subsidies that the MT and Dakota schools yet.. kind of interesting
I would assume those numbers would have to increase if a move-up occurred.