That is, if I were the judge, I don't see how such a class action would meet the 23(a) criteria. That's what briefs are for, of course, so perhaps I could be convinced otherwise, but at first glance I don't perceive numerosity, typicality, or common question of law and fact.
I'm not suggesting that students -should- be sanctioned without due process (for any reason, not just sexual assault) but that it's not the proper subject for a class action. There's no "common question," for example, since each university has its own policy and process. And if you were to sue just one university, or even a university system such as the University of California, there would be too few plaintiffs to certify a class.