I enjoyed my college experience and as the first ever college graduate in my family I wouldn't do anything different. Colleges provide something far more beneficial than the shot at FU money.
That said, some people are better off dropping out or never going at all. I'm highly suspect of learning how to be an Entrepreneur in a college setting and guess something like YC is probably better for that.
I think of YC as almost a trade school for start ups but it still doesn't replace college. I wonder how many successful start uppers go back to college later? Any of you? Like Shaq and Troy Polamalu? :)
And I guess that school-like vibe is why YC is better than simply dropping out and taking 100k. Even if you fail, you still get the YC experience to help you with your next venture.