That's really the key point. Not that roboTaxis are on the near horizon but, if you believe they'll change everything when they arrive, you basically need to point to all the cases that today are almost (but not quite) enabled by Ubers driven by minimum wage drivers.

Do Zipcar and Uber make a difference on the margins? Sure. I know people in fairly dense non-NYC urban area that probably would still have ended up with a car 10 years ago who can get by without one today. But there's a big difference between change at the margins and fundamental shifts.