Come to think of it, you might be right.
SC case U.S. v. Wong Kim Ark, a case that has been referenced to death concerning Pres. Obama's natural-born status, set the standard for granting U.S. citizenship onto persons born in this country to non-U.S. citizen parents as long as the parents weren't foreign diplomants and had previously established residency INCONUS. Congress could go the route of trying to change the conditions of "U.S. jurisdiction" without adding the 1-parent requirement, but I doubt that would fly due to aspects of common law.
So, upon further review, I have to agree. The only way this 1-parent requirement for children born INCONUS to alien parents flies is if the 14th Amendment is changed to read:
"All persons born or naturalized in the United States, and subject to the jurisdiction thereof, to parents, one of whom is a U.S. citizen, are citizens of the United States and of the State wherein they reside and are, therefore deemed natural-born, except for persons born to non-resident immigrants."
Or words to that effect as outlined in
RED. I doubt it will happen, but...