Agreed. You bring up an interesting point about social pressures b/c they are the driving force behind this whole thing. I'd like to run w/ this for a sec...
It is NOT socially acceptable to not attend college. It IS socially acceptable to not get funding for your startup. So what happens when someone wants to go to college but they don't have the money? They get loans, they work two jobs, they do what they have to do to make it happen b/c they will be socially rejected if they fail. The same is not the case for funding. If you are committed to your idea, treat funding like a college loan: Not optional. Once you get in this mindset you'll figure it out. You may not get a full ride at MIT (YC) but in state tuition + a TA job at U Mich isn't so bad either.
As of now nobody has commented on a sucessful YC reject. I think that is b/c YC applicants tend to be straight A students (blind generalization based on instinct.) Straight A students have other options that involve less social risk. I know of a number of successful entrepreneurs who were thrown out of / barely made it through college. Since they didn't have other options, they HAD to make it work. And since they had been failing their whole lives they've realized that failure is just someone else's or some organizations opionion about them. For good or for bad, they tuned those opionions out.
People need to realize that the currency of "failure" is just a bit of social rejection. Running your startup into the ground will not give you cancer. And a big fat 'F' on life's report card is just a sign that at least once, you weren't afraid to push the limits...