And if this thing ever goes to trial then no doubt Taitz and/or Kreep will try and make that part of their case. So the judge may rule once and for all. If it goes to trial.
It then becomes an issue of how old his mother was, how long she’d been in the US, how long outside the US, etc. Only one parent has to be a US citizen per the “native born” law.
My understanding is that if Obama was not born in the U.S. then under the laws in effect at the time he did not gain natural born citizenship status through his mother's nationality.
I believe that is true - technically. However, it is only true because of her age, and also by current law he would have been natural born. So it is something of a technicality and probably not important enough to remove a sitting President.
However, his credibility and trustworthiness, already damaged, would be totally shot.