The loss of nationality act was passed in 1952, IIRC, which again makes this concept a 20th century invention. As it was originally written and in effect when Obama was adopted, it would not have prevented him from renouncing his U.S. citizenship (providing he ever had such citizenship) as a child. And again, the more important issue is if he retained Indonesian citizenship as an adult, but lied about it in order to sway voters into believing he has always been a U.S. citizen when he was not.
While I think it is pretty clear that Obama, if born in the US, is a natural born citizen, I can at least understand the concern and wish the Supreme Court would make it a formal ruling.
I do not understand how someone could claim he was born in the US but had lost his citizenship as a child. That is almost impossible to do.