Earlier quoted context omitted.
This is already possible today. You don't need driverless cars to do it. Uber can already do it, but it's not taking over. Unless you're suggesting we will have more cars just sitting around waiting for rides, because they're driverless. Then we get back to them being so convenient that nobody will want to ride with another person. In other words, why does making the car driverless suddenly make everybody want to use…
IIRC something like 70% of the cost of Ubers is driver compensation, meaning driverless Ubers have the potential to be ~3x cheaper.
Do you know what percentage of driver compensation effectively goes to car ownership and maintenance?