They're very much ingrained in the American high school psyche so I can't help but foresee some kind of media shit storm if they were to just disappear, but I do think they're largely a waste of time. Not everyone cares about school sports and they do take time away from classes, but besides getting the student body excited, they're advertising. "Come to our game, support our team, buy a hotdog!" I haven't been in high school for 8 years so my opinion hardly matters, but I'd prefer to see them as voluntary. You can either go to them or go to the library to study, then go to your next class. Something like that seems to please both sides.