NetDensity (Brendon Slotterback) The Rest Of The Story On Robot Cars is less sanguine (though still net positive) about the prospects of robot cars, as is Brad Templeton.
I would just note (a) I like cities (by which I mean a dense concentration of activities), (b) I think cities are a nice solution to the accessibility problem, but (c) cities are not the objective, accessibility is.
Also, I am suspicious of the claims about environmental and public health effects of the suburbs, especially after concomitant electrification of vehicles.