While I fully recognize this as nothing more than a thinly veiled (and horrible) trolling attempt, I'm going to nonetheless answer your question:
Well after Montana moves FBS.
The reality is that msu is considerably behind UM in readiness. Consider:
MSU would need significant (and costly) expansion and upgrades to RHS. UM already has the capacity necessary.
Absolutely NO FBS conference is taking a school without soccer and softball. So msu would need to build these programs -- not to mention fund and build the facilities!! -- from scratch. Ouch.
Both departments would likely need to add programs, but UM can easily -- and with extremely minimal costs -- add women's lacrosse (field is already there on the south campus), men's soccer (again, field) mens golf, and if need be, women's swimming and diving. What is msu going to add that doesn't come with an enormous facilities price tag? They have zero facilities for additional sports.