This is more or less what happened to Eric Drexler, as far as I can tell. He presented his vision of nanotechnology, and people said, “Where are the technical details?” or “Come back when you have a PhD!” And Eric Drexler spent six years writing up technical details and got his PhD under Marvin Minsky for doing it. And Nanosystems is a great book. But did the same people who said, “Come back when you have a PhD,” actually change their minds at all about molecular nanotechnology? Not so far as I ever heard. It has similarly been a general rule with the Machine Intelligence Research Institute
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