Do you really not understand how the Court system works?
Your issue seems to be with standing. I think Cruz could find a way to get parties with standing. The NBC issue is clearly a federal question and if Cruz were nominated, certainly the Democratic nominee or maybe even the Party would have standing to challenge Cruz’s NBC eligibility. I agree with Trump that almost certainly the Dems would challenge Cruz if he were nominated for President or even VP. The Dems would be stupid if they didn’t and one thing about the Dems, when it comes to political advantage, they are not stupid. It is what they live for.