I dont really follow that logic. How can an 8 seed get to the sweet 16 but no further. That means you beat the number 1 seed, at that point i think you would think they could anybody left in that bracket. Who knows maybe we can be the next george mason
What's wrong with that logic? They could upset the #1 seed then lose the very next game, which would very likely be against another seed higher than 8. By your argument, if a 16 seed won their first round game they should then be expected to win the rest of the way because they beat the 1 seed, and that isn't very realistic.
And George Mason is a mid-major...it would be much less of an upset for a BCS conference team to make it to the Final Four...with rare exceptions (Davidson, Butler, etc.), the 7th or 8th best team in the ACC or Big East would be the best team in a smaller conference.
As for BC, they have been so up and down all year, which happens when you have only 2 upperclassmen on the roster. I mean come on, you win at UNC and vs. Duke, but lose at home to Harvard??? I could see them either getting pummeled in the first round or winning 2-3 games.