Personally, I find it disappointing that this is perpetuating the inherent inefficiencies of the car concept, carrying a small number of people, usually a single person. The ultimate end game where cities are full of autonomous taxi vehicles that aren't owned, but paid for by usage makes sense though. You fire up an app / web link or SMS and a car appears within 5 minutes, drops off someone else and takes you on your…
"Self-driving" systems for carrying big numbers of people have existed for centuries now: http://en.wikipedia.org/wiki/Public_transport