Campus Panhellenic (PHA) and IFC have issued a joint statement. It's a good read, I think.
http://greeklife.missouri.edu/2015/0...coming-summit/
I will note that to the best of my knowledge none of the sorority and fraternity properties are owned by the university or on "university property." But I'm not 100% sure on that. I know the streets and sidewalks in Greek town are maintained and owned by the city, not the university. But MU police department has jurisdiction.
I haven't thought through the legal implications, as this isn't my area of practice and I hesitate to commit without research. But I also don't think the proposals are likely to be mandated as is, so that's another reason I haven't thought about the legality.