of two schools that will both bring 40,000 fans or more.

I’m curious how many BYU will come for this game if they make it.

Uneducated guess 30,000-35,000?
BYU for great turnout in Texas I want to say gets 20,000. Recalling games in Houston, Texas, Baylor, SMU. Seems like the low end was 10,000-15,000 at those games.

Assuming even more draw 150%-200%.

According to the provided information, AT&T Stadium has a seating capacity of 80,000. However, it can be expanded to accommodate over 100,000 spectators by using temporary structures and standing room areas.