I just don't understand making attendance that big a deal.
Never mind the regionals - look at the Frozen Four. Did Denver care that their repeat championship in '05 came at a venue where demand for tickets was so soft that some folks didn't even both looking for buyers? I left my extras on a bench outside an arena entrance. From my perspective, Maine's "comeback" title in 99 was not diminished in any way by the fact that it happened at sparsely-attended Anaheim. Heck, I think there were Team USA hockey games at the '80 Olympics that didn't sell out.
I'd rather try to work around the edges and improve attendance at a neutral site than deal with the diminished excitement of campus sites. Sure, on a game by game basis, anything can happen. In the bigger picture, though, you have to know that upsets will be less likely than they already are. And isn't that the goal? It's called March Madness. Not March-Organized-to-Maximize-Attendance-and-Revenue-While-Protecting-Higher-Seeds-at-the-Expense-of-Diminished-Unpredictability.