Agreed. The "we all live happily ever after" inference does contradict Deutsch's idea, which I noticed a little after writing this, and so corrected the wording (before seeing your comment) thusly:
(Or, presumably, so Optimism demands, since the AIs are unpredictable, and technology.)
http://vimeo.com/22099396
What do people think of this, from a Bayesian perspective?
It is a talk given to the Oxford Transhumanists. Their previous speaker was Eliezer Yudkowsky. Audio version and past talks here: http://groupspaces.com/oxfordtranshumanists/pages/past-talks