Future MW Additions The more the better seems to be the formula that the power conferences have pursued. The Big Ten has 18 teams, the ACC has 17 and the SEC and the Big 12 each have 16 teams. The new PAC 12 is currently set to expand to 8 teams and they are most certainly looking for more.
So, if the current MWC and the PAC 12 were combine, they would form a 19 team conference. Of course, Gonzaga and Grand Canyon do not have football, Northern Illinois is for football only currently and we don't know when the Aggies will formerly move to FBS. Adding Sac State would bring the conference to 20 teams total.
There's little chance of this happening but it certainly would expand the footprint in the west!