I read The Singularity is Near a few months ago. He makes a lot of predictions with great confidence and accuracy. Some of which are now in the past and others have basically zero chance of becoming true. His entire "AI will herald in a new era of nanobots" is pure speculation.

He now makes new predictions for the future with similar confidence.

Ray Kurzweil lives in an alternate reality. He's like one of those "the rapture is near" preachers types who keep moving the date for the rapture. Any moment now I expect him to start handing out Kool-Aid during one of his talks. I wouldn't recommend drinking that.