What we have currently; maybe four or five 9s of reliability in perfect conditions is not nearly good enough for autonomous car sharing. If the car breaks down or is in a collision what is the passenger going to do? drive it themselves to the shoulder and get out? How far are we from autonomous systems harmoniously and safely coexisting with the most erratic human drivers/bikers/pedestrians? How far from adverse weather conditions? How will we finance 100 million $80,000 autonomous vehicles.
Automated collision mitigation is already in many new cars and the data on accident rates is just materializing. Toyota preemptively put it's radar/camera based system in ALL of their cars for 2017. Its rumored that the NHTSA will mandate it for all manufacturers in the near future. The gradual progression of these developments is that these systems will add features incrementally and gain economies-of-scale until one day in the far far future driver input will be minimal. Only then will autonomous ride sharing become viable.