>Taxis are a lot more expensive than self-driving cars.
But they have the advantage of actually existing. Whatever relatively near-term possibilities there may be for cars to operate on "autopilot" on certain highways, an urban environment where taxis are most common is probably one of the last places you'll see self-driving cars.
Sure. I'm just pointing out how these hypothetical self driving taxis/car shares would be a substantial improvement over actual taxis, enough so that they would be able to displace more than just the niche that taxis currently occupy but also car sharing programs like Zipcar and probably a substantial portion of car ownership.
I think that I'll see them in my lifetime; I don't know if it'll be in 5 years (though I think that would be pushing it), 10 years, or 30 years, but I'm pretty sure they will come about, and will be a huge improvement over our current system of letting distracted, impatient people try to pilot cars through chaotic conditions.
But they have the advantage of actually existing. Whatever relatively near-term possibilities there may be for cars to operate on "autopilot" on certain highways, an urban environment where taxis are most common is probably one of the last places you'll see self-driving cars.