The most important change, and it's been going on for at least three decades, is the increasing "professionalization," if that's a word, of the faculty. By professionalization I mean the tendency of faculty members to have Ph.D.'s in their academic specialties, and for these specialties to be ever more narrowly defined. The higher-rated schools may have chief executives in residence or retired execs on three-year teaching fellowships, but the days when most faculty members had considerable prior experience as businessmen or women - those days are mostly over.