The pregame is all about building excitement up to the kick-off. I can appreciate the "tradition" aspect, but the Bells of Iowa State was a total downer when it was played after the National Anthem. I thought so at the game on Saturday and watching the video this morning- I still feel the same.
Play it before the national anthem, play it after the game, I don't care. After the national anthem it's a wet blanket.
Almost every school's band plays their alma mater during their pregame. That isn't going to change.