They're going to be playing to mostly empty stands...or people are going to just blow right past the rule.
When I'm working, I'll listen to Dave Logan on the radio in the morning (sports guy, former player, Bronco radio announcer) and see what he has to say about this. He takes phone calls, he and his partners will debate it.
They actually talked about this a month or so ago and dismissed it as absurd...said fans simply won't do it. They spent probably two minutes talking about it...I bet they talk about it for considerably longer today.