As I understood the article, they pretty much admitted that the current law implementing the constitution would make Cruz eligible. What they wanted to challenge was that law and whether it actually represented the constitution. Their argument would be that the Supreme Court has never decided on this issue. They haven’t.
If they get such a hearing from Scotus, then:
1. It tells us that Scotus is establishment down to their bone marrow. We already know that, so I wouldn’t be surprised in the least if they took up such a case.
2. It ices a lot of people when considering Cruz. They’ll be wondering what Scotus will decide. It would hurt him. I have no doubt.
SCOTUS didn’t take up any of the cases against Obama, and there were a bunch.
If I understand correctly, the Constitution leaves the issue of citizenship up to Congress. If that is the case, the law passed by Congress will stand.