where I grew up school discipline was plain and simple, u get a discipline note once , twice, third time you have to repeat the whole year even if your exams scores are fine. You keep doing stupid things nonetheless, you get expelled from that school, no if no but. Athletes? No differences at all. And during teaching not a fly moves...always. Actually once we complained to the school principal because we perceived that one teacher had slightly too soft/slacking attitude.
That's how it should be imho. School is a place to learn and open your mind, professional multi-millions earning athletes don't bring anyone any benefit except as tv-party hooligans people entertainment.