Earlier quoted context omitted.
GM is not in the taxi business and has never been in the taxi business. They see this as a way for manufacturers to get into the taxi business and perhaps one day dominate the taxi business. Cut out all the middle men.
Surely it reduces the total number of cars, though? The vast majority of cars spend most of their time idle. With this model, you could supply the same total need with many fewer vehicles. Unless GM owns the whole fleet and Jacks up the price, losing that much demand strikes me as pretty rough.
Plus the downshift won't be as great as some predict. You'll still need enough cars for long commutes. And cars lifespan are measured in miles not years. Autonomous cars might actually increase the number of miles driven (commute while sleeping, alternative to public transit, or driving instead of flying).
A car sitting in a driveway will last longer than one doing stop and go traffic 23 hours a day.