Everyone in these conferences mostly got their numbers by playing games against Colorado, Texas, Oregon, USC, Washington, and Oklahoma

As an experiment, let's remove Utah's (and other team's) games against those opponents (and replace with the average of televised other games) and see how that ranking ends up

1. Oregon St 13.86M
2. Utah 12.43M
3. Iowa St 12.30M
4. BYU 12.15M
5. West Virginia 12.09M
6. Oklahoma St 11.02M
7. UCLA 9.93M
8. Kansas St 9.92
9. Kansas 9.91M
10. Washington St 7.13M
11. TCU 6.79M
12. Texas Tech 6.18M
13. UCF 5.57
14. Cal 5.54M
15. Houston 4.36M
16. Cincinnati 4.12M
17. Arizona 3.55M
18. Baylor 3.53M
19. Stanford 3.41M
20. Arizona St 3.25M

So this does make BYU look a bit better...which is nice, but not really the point.  The issue is that if you take out games against those marquee opponents, the headliners of the conference are ... Utah, Iowa St and BYU.

If you look at the games including top opponents you can maybe include TCU as one of the bigger draws. So now we're left with a conference led by Utah, BYU, and TCU with some solid secondary teams (Iowa St, Oklahoma St).

Which sounds a LOT like the Mountain West

(Note that this analysis is probably somewhat unfair to the former PAC teams. We're ignoring more of their opponents, which means that their FCS games weigh more heavily.  Plus they have the aforementioned PAC12 Network issues.  It doesn't change much though. Oregon St, Utah and Washington St would probably look better, but Oregon St and Utah are ALREADY at the top and Wazzu isn't going to the Big 12 anyway)