It may seem outrageous in some cases, but you'll have to amend the constitution to change it. That loophole resides there. Granting the difficulty of amendments those desiring to change the status quo need to focus their efforts on keeping such potential citizens out of the US while in utero.
No, it is the misreading of the 14th amendment that has caused this problem.
At that time, being born here probably meant you were going to stay for a while. Today it means you got on a plane. I read that Koreans organize special trips to the US so that women can have their babies here.