I know one INFJ who has and is seriously preparing for a possible apocalypse. But I also know of one ISTJ who is as well, and two INFP's.
I'm still bad at fully describing or really understanding the differences between Ne and Ni. But I see Ne as scanning for possibilities, which is what my ex was doing with his signs and symbols. Perhaps he wasn't as serious about his ideas as I had thought. And he wasn't always talking about that sort of thing... but over time, this aspect of him got stronger and stronger to the point it was as though that was all he had to talk about, were various readings that I saw had little rationale.