Raising a startup is the best education you can get.
I'm pretty sure that the experience/knowledge that a startup gives you is much, much more valuable than you'll gain in any University. Even if you go back to your job, you'll still be far, far ahead than if you were to work those years that you spent building a brilliant startup.
I hope you apply for YCombinator, and if you don't...wait a few months and do it again! :)