As for some states, having alcohol on state property is against the state law. Thus it's not allowed in state owned stadiums. Of course somehow the University president was able to skirt this law when he had private receptions for big donors and they served alcohol at them. (go figure).
but at the Student Ticket gates, they had police at every gate and you got patted down and searched for alcohol because of people sneaking it in and getting too drunk. Students will adapt. They would just sneak it in using ziplock freezer bags which were hard to tell (compared to glass bottles) during pat-down.
after the game, you'd see dozens or hundreds of empty ziplocks lying all over the stands in the student section.