I believe this is completely antiquated and is exactly the type of thing that is worthy of amending the constitution over. When this country was formed, it was a completely different world and the issue made sense. I think that it is a real shame that kids from Korea or China or wherever who are adopted as babies into familes of US citizens and know no other world besides the United States cannot be president because they were born elsewhere. Let us not forget that the president has to be elected so the concern over allegiances is pretty remote, given that they have to win an electoral victory anyway. Obviously, there would need to be SOME guidelines, with respect to citizenship, etc., but in theory I'm all for foreign born Presidents.
All those arguments were entirely valid back then.
In fact, the Constitution says that those who immigrated before its adoption are eligible as Presidents.
Seems to me the Founding Fathers seriously undervalued the longevity of the document they drew up...and the difficulties in changing it.