Birth Certificate Released; Trump Done?

Obama has finally released his birth certificate. In the process, I wonder if Donald Trump is now finished as a (semi) serious candidate. He has made his whole campaign so far about Obama hiding his true birth. If this is no longer the case, I think Trump just lost a lot of credibility.

I don't know why so many people made such a big deal over it anyway. There are literally thousands of valid reasons to campaign against Obama policies; the birth records were already irrelevant at this point.

*Update*
Perhaps I am wrong after all. Trump handled that about as well as possible. Most politicians would have apologized and climbed into a hole, having sensed defeat. Instead, Trump takes credit for finally getting records disclosed and then transitions to talking about college records and gas prices. He might not be a great GOP candidate, but he is taking (and giving) punches for the GOP.