The thing with autonomous ride sharing though, is that the car has to make it from its last stop to your home on its own. And there's any number of scenarios t

The thing with autonomous ride sharing though, is that the car has to make it from its last stop to your home on its own. And there's any number of scenarios that can happen on its way... a traffic light could lose power and turn into a 4-way stop, for instance. Or a big event at a large venue where hundreds or thousands of pedestrians are crossing the street and you kinda have to inch forward and wait for some of them to wave you on to go forward (basically everybody jaywalks at that point.) There's a million different 0.01% scenarios that could happen, and if you ramp the usage of a really really good autonomous car up to scale, you'll see them every day. Unless it can handle all of them without intervention, you simply can't ditch the driver, or you'd face huge PR nightmares when you either hit a pedestrian or you block an intersection and cause huge traffic in a major metropolitan area ("Mayor bans autonomous cars due to one too many gridlocks caused by them", etc.) I really think it's down to the PR issues and the fact that one too many mistakes can really kill the idea, that companies will be cautious to just not need a driver altogether. And for autonomous ride sharing, you must be able to do nearly half your miles without a driver. Hence why that last .01% is still crucial.