Chabad does an effective job of gaining the attention of Jewish college students. I'm sure liberal Jews would want to do things differently than Chabad. However, having available serious Jews who can answer questions about Judaism and illustrate what Jewish life is like is rather important. I think Jewish families near a college can invite students over for Shabbat dinner. Parents need to be able to give convincing arguments against intermarriage.
Most parents are too confused to give their children effective guidance about intermarriage.
Rabbis can help here. Parents should feel more comfortable talking to rabbis about children who might intermarry. Rabbis don't have any magic answers, but they can be a source of strength to parents, and they can articulate Jewish views more clearly than parents can. I saw a story in the NY Times about the population study, but I don't remember seeing these figures there. It is hard to respond to a presumably serious and well-conducted survey with anecdotal evidence, but my experience doesn't seem to confirm those figures.