1 - the zip cars available to me are a few blocks away to walk which isn't convenient if I'm carrying something or lazy.
2 - high cost. Taking uber right now is so much cheaper. Imagine if cars were self-driving. Costs would plummet
3 - parking. This can be very hard depending on where I'm going
4 - I have to pay for the length of time I'm out, not for my ride. I also need to return the car when I'm done.
These are the biggest pain points in my opinion. Also, not needing to drive myself is a huge bonus. The leverage of solving these pain points are huge, imo.
the bike shares solve this by driving trucks around, collecting bikes from areas where they aren't going to be needed and moving them to areas where demand is about to spike. it's hard to load up a truck full of cars to meet demand in the business district at 5pm, but it's very easy to send over all the spare capacity in your autonomous vehicle fleet.
Smoothing that out, so that you come to expect a car to be available very rapidly no matter what, with only minor inconveniences, may not end private car ownership but certainly will make a lot more people opt for alternatives - I know for myself (I don't own a car) the occasional lack of predictability in how soon I'll get picked up is the one aggravation that occasionally make me want one.
Comparing either of those or public transit to self driving cars misses the point entirely.
Self driving car networks basically can solve that.
It does not matter if a car is selfdriving or not. To be recognized as available by someone means a utilization of about 30% by the providing company. But a utilization of about 30% does not drive down costs. You still of costs for producing and servicing the vehicle, which is way higher than just the energy costs.
Tesla has no experience in free floating vehilce fleets. Uber has no experience in such thing. ZipCar has. Car2Go has. Car2Go as an subsidary of Daimler even has experience in car production.
Now think of that.