As of now and until and if ever SCOTUS take up the issue precisely identifying with extreme clarity NBC then it is settled law. To that point Levin is 100% correct. In the here and now it is settled law. Just like gay marriage was years ago until last year. It is now settled law. In 20 years it could change and that decision then becomes settled law.
Your homo marriage is a good example. Maybe SCOTUS will find that "natural born" means "naturalized", just like it found homo marriage in the 14th amendment. SCOTUS is a disgrace anyway, who says it can;t write out the NBC clause, amending the constitution, by fiat. After all, Obama proves that Congress already did, and we all know the constitution is written on toilet paper.
Some defender of the constitution you turn out to be. Subversive, that's what you are. You spit on your country.