He does touch on the idea of a singleton that enslaves humanity, as one of several possible negative outcomes of our not renouncing technology and destroying modern society.
(It's been about 10 years since I read his manifesto, so I'm not very confident that I remember it accurately.)
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/12/19/BUFU1MD58T.DTL&type=printable