You make good points, but BYU had good ratings, football performance and attendance in 1994 and 2010 and 2011 and 2016. I wrote all kinds of posts like your's about what good members of the Pac-12 or Big 12 they'd be.
I think Utah would be a good member of the Big 12, but it's not that simple.
Rutgers didn't have any of those things and they got it.