I've been watching these threads for quite some time. And if Obama did produce his birth certificate I would predict that the overwhelming majority of the people on these threads would immediately say, "Yes, but Hawaii issued birth certificates to anyone who asked. It doesn't prove anything." A sizable majority of your cohorts would not believe Obama was born in the U.S. if the substantiation came from a burning bush.
That is a pretty lame rationale for not wanting him to produce a document that is trivially simple to obtain and distribute.