By the way, Particular Vehicles have been safely serving Particular Areas for decades: airport driverless shuttles. Slowly expanding from there is the right way to go, not "New York to Palo Alto by 2017", as Musk promised.
Yah, without any evidence to back it up my personal suspicion is that we'll arrive at a local maxima of "full self driving on highways and instrumented roads" in ~20 years. I think the area has a lot of potential, but so much of the hype (and stock price) is tied up with "a car that can drive better than a human everywhere" which seems impossible for anyone to produce.
Just like with IoT we'll eventually arrive at a boring, useful state...it will just take a while.
