"The petrochemical revolution gave us free energy—free mechanical energy, in this case. It changed the texture of society in most ways. This revolution, the information revolution, is a revolution of free energy as well, but of another kind: free intellectual energy." (page 2)
This is the vision - freeing the intellectual energy.
One reason there are still lots of truckdrivers and not AI's driving those trucks is that even if you could build one it would be very hard to make it cost effective.
Long term it will probably be more like the drones piloted by guys sitting a couple of hundred (or thousand) miles away, jobs will be broken up into groups based on the 'hardness' of the problems that need solving and then get parcelled out a-la the mechanical turk.
This is the vision - freeing the intellectual energy.