http://espn.go.com/college-football/team/schedule/_/id/252/byu-cougars
Not gonna get that kind of schedule in the Mountain West. Nor are you going to be on ESPN every other game. At least, my limited BYU Football experience has the Mountain West as a rather lousy situation with poor exposure.
There may be redeeming and more plausible end of season scenarios for decent exposure and prestige, but I kind of like the idea of playing on ESPN/ESPN2 for 6 weeks of the season against credible opponents to playing on ESPN for 1 week in the post season against a credible opponent.