Honestly, as someone who finds the current situation a bit abhorrent, and who generally disagrees with most things I've heard come out of Thiel's mouth, there are way worse choices.
He has knowledge of the tech sector and doesn't want to ruin it, he isn't anti-science, he's gay (and thus pro-gay rights), etc.
That said, I think it's profoundly unlikely, since unless I'm not aware of it, he'd be the only supreme court justice with no legal background.
