The only thing that really matters for YC is if the company can be acquired. With Google just buying a bunch of robotics companies and the belief in "geek exceptionalism" as high as ever I've seen worse bets.
YC now (publicly) looks like it's working on the ideas and types of companies that the world needs more of. If this shift is real, it opens up YC to smart people without CS degrees. (I know it was before, but it's perception as well) And there are exits, they're just outside of SV. GE, Philips, Exxon, GSK, Pfizer, Bombardier...