This is the correct answer. Assuming there's not citizenship issues, I think Thiel would be one of the best possible "non-politicians" who could be nominated by the GOP for several decades
Probably someone who has yet to come out.
Jason Smith, congressman from Missouri? He's definitely fruity. I doubt a SeMo congressman would every willingly come out, though
Thiel is not a natural-born citizen.
There's an interesting theory that the natural-born citizen clause was implicitly repealed by the Fifth and/or Fourteenth Amendments, since courts have held the equal protection clause protects naturalized U.S. citizens from federal discrimination based on national origin.
Even if we didn't want to go that far, it seems reasonable to suggest that Congress could allow naturalized citizens to run for president by simple statute thanks to the 14th Amendment's Enforcement Clause.
And then, of course, the ultimate backstop would be that the Supreme Court is not ever going to invalidate the election of Peter Thiel (or some other naturalized citizen) if he managed to get on enough state ballots and win enough votes to actually be elected president. At that point, it's somewhat of a nonjusticiable political question the court wouldn't want to wade into.