I said it earlier in the thread but a suspension for the coach would also do it. One game for the first offense, 3 games for the 2nd offense, etc. You can guarantee the coaches will make sure it stops at that point.Storming the court cannot be stopped absent the national guard or a very large police force being stationed at courtside. Even then, its iffy. If there is one truth that has lasted for all human history, it's that the mob rules. If 4000 people want to migrate 50 feet quickly, they will do it. There is no fine that will prevent it and we already know that.
Forfeiture is literally the only way to stop it if you want to stop it. That's the only way to make it hurt enough for the fans to make them restrain.
With that said I don't think they should stop it but make the students stay off the floor until the opposing team has left the floor. If they don't then those suspensions kick in.