The same is true for people born into war zones not fully under US control. I still wouldn't write this off. All it takes is a compelling argument for a new interpretation of "and subject to the jurisdiction thereof".
It's pretty easy to make a compelling argument.
The 14th Amendment was intended to address the citizenship status of freed slaves and their descendants post-Civil War. It was not meant to apply to the children of immigrants, particularly those who were not legally present or had not pledged allegiance to the U.S.
A stricter interpretation of "subject to the jurisdiction." means it should require complete, exclusive allegiance to the U.S., which might not apply to children of undocumented immigrants due to their parents' legal status or nationality.
You could also argue that the current interpretation dilutes national sovereignty by automatically bestowing citizenship without a clear reciprocal pledge of allegiance from the parents.
The fact that children of diplomats do not automatically gain citizenship due to not being "subject to the jurisdiction" in the fullest sense could be expanded to include children of undocumented immigrants, arguing that these parents, too, are outside full U.S. jurisdiction.
Finally, United States v. Wong Kim Ark was decided under different circumstances. The socio-political context has changed. This could be used to justify revisiting the original interpretation.