You're the one with the book - you tell us
Presumably he thinks people will share their personal car. But I wonder how many people would want to share their car at 7.30am on their way into work. Or hang around after work waiting for their neighbours to turn up so they can drive them back home again in their personal car.
And who's gonna spend 30k on a robocar so they can drive their freeloading neighbours into town (assuming they like them in the first place).
The contrarians argue that robocars might make things worse. People will 'drive' their robocar into town and tell it to drive around in circles while they do their business. Multiply that by 1,000 people and you've got gridlock!