My Take on the situation;
Keep in mind that it's not just the "drunk sorority" student who doesn't like this change. A vast majority of students who have been answering polls on Facebook have said they hate it, Brian acknowleged as much in his front page post.
So while everyone here likes to bash the kids who are drinking, the so called "drunk sorority girl", for hating this policy, every student does basically.
Whether kids are pregaming or just sitting in their dorm room, most students would rather have a guaranteed seat at a certain spot that they can get whether they leave at 11:15 or 11:45. Now they have no idea where they'll sit before hand, and most people would rather do whatever they want than have to stand in line for 30-45 minutes before they normally would and still not be guaranteed a good seat.
That being said, as a current student and someone in Greek Life, I'm in favor of the change. I'm willing to leave 30 minutes ealier to get a better seat, I'll just start pregamming 30 minutes earlier. I think if you're willing to wait in line for an extra 30 minutes, you should get a better seat. I'm also fine with reducing the size of the student section. But just keep in mind, this isn't just Greek life who doesn't like this change, most students don't.