Waiting for Strong AI

Back in the 80s we were waiting, and expecting the emergence of Strong AI.  Generalized intelligent machines, that would be as intelligent as a human, and do things humans can, but faster and cheaper.  Run our plants lights-off.  Well, that has not happened yet. Neither Watson nor Siri are close.  If it did happen, its implications would be enormous.  So how do we predict that it will soon happen, so we can prepare?  Ray Kurzweil takes the question.  But doesn't answer it.