The inevitable consequence of Obama releasing his "long form" (new media buzzword alert!) birth certificate will not be mass recantation of birther-ism, nor will it be expansion of the birther conspiracy theory to include the forgery of the long form certificate (among Newt Gingrich types, anyway). Rather, it will be the revelation that the birthers never really existed in the first place. Even those people caught on the record questioning Obama's birthplace didn't really think he wasn't a "natural born citizen." It was just the principle of asking for verification of citizenship, you see!
It's the same reason we now know the 1972 presidential election was stolen. Ask everyone in the country older than 58 how they voted, and you'll find that nobody voted for Nixon. CREEP was that good!