They're still around, most of them having landed in the Rationalist/LessWrong community along with Yudkowski. And then some of them, like Anissimov, et al, mov

They're still around, most of them having landed in the Rationalist/LessWrong community along with Yudkowski. And then some of them, like Anissimov, et al, moved onto the Post-Rationalist community, with a small percentage of those moving onto Neoreaction, and a small percentage of those moving onto radical Accelerationist politics. I think what happened is that a lot of these bright-eyed and bushy-tailed youngsters who saw Singularity and/or radical life extension happening in their lifetimes eventually came to accept that they're not totally wrong, but they'll be long dead when it does. There was a sort of demotivation that happened to push them into more tangible efforts, even some as prosaic as politics.