This is what's happened to the MWC while BYU has been an Independent
I included the legacy MWC schools, then decided to throw in Boise since they're touted as the school who gets a sweet financial deal from the conference:
Money doesn't equal winning, but it makes winning easier. Did your school just complete a disasterous 4 win season? Do you want to go out and hire some expensive coaches currently working at big name P5 schools? Do you want to put together the highest-paid coaching staff in school history to try to fix your program? If you're a MWC team on a MWC budget you don't have the money to do that. The MWC is not an option for BYU, unless football isn't part of the equation.