As far as greeks going dry with respect to Darmouth: Many of the greek chapters there are locals so they would not be affected by Select 2000, or any IFC/NIC/NPC policy regarding going dry. And that's another reason that admin is able to require all groups to go co-ed.

In the same respect check out the following article - (only, you do have to subscribe to see it):
http://chronicle.com/

The article is entitled: "College's Fraternity Rule Does Not Violate Antitrust Laws, Federal Judge Rules" The first paragraph reads as follows.. (needless to say i was horrified!)

Hamilton College did not violate antitrust laws when it required students to live on campus and not in fraternity houses, according to a ruling Thursday by a federal judge. The decision -- which followed an appeals court's ruling that the college's policy could be challenged on antitrust grounds -- is a key victory for private liberal-arts colleges seeking to ban Greek systems.