"Well then, I guess he is American and we can drop all this nonsense about his birth certificate."
Not necessarily. There is still the issue that he was legally adopted by his step-father and taken to Indonesia where he would have become an Indonesian citizen. (Indonesia does not recognize dual citizenship.) The problem for Obama...er..."Soetoro" that remains is how he was able to travel to Pakistan and other "no travel nations" for American citizens in 1981. The answer seems obvious: he was traveling on an Indonesian passport issued because he was - and reamins - an Indonesian citizen.
For what it's worth, Andy Martin's presser presented no substantial evidence proving this latest conjecture. He has no more access to a "vault" birth certificate than anyone else does, which would conclusively prove to whom and where Obama was born.
Finally, as someone else pointed out, the identity of Obama's real (biological) father has nothing to do with where he may have been born. If reports Berg has obtained are true, Barack Sr. and Ann Dunham were married and traveled to Kenya, but due to the late-term nature of her pregnancy was not allowed to fly back to Hawaii. If she gave birth in Kenya, he is not a "natural born citizen" and is not elligible to hold the highest office in the land.