My disorganized thoughts on the matter: He either is right and the world is going to end and it's already to late to do anything about it, or he is wrong. Neither are useful propositions, even if everyone agreed with him nothing would change. We don't do anything real about climate catastrophe either and that has majority support in science. I don't see much personal utility in knowing the fact we are all certainly going to die.

And to be a movement leader he would have to be a bit more charismatic, but he lingered in obscurity for so long that I don't really buy it. He had some very stimulating conversations, we are so starved for intelligent conversations but I doubt that will ever have mainstream appeal.

I would reject the idea it's some sort of long-con, he strikes me as a very genuine person that is a strong believer in what he is saying. More like a Richard Stallman type figure, harmless.

I wished he would write more fiction, HPMOR was so good.