It's going to happen and probably fast than we think.
The testing is very clear, and every accident has been human error, either another driver or a driver taking over driving and doing something dumb.
If you're in trucking, be afraid, I don't see anyway that these things aren't going to be doing trucks soon. Like within the next 3-5 years. At the lower speeds trucks can go, the efficiency and 24/7 nature is going to be huge, They'll need someone to pump gas though so yay.
Then you'd think taxis etc too, ubers. Instead of parking you just put your car in uber mode and let it go earn some money while you shop etc!
The scary thing for the economy is, while this is all great overall, driving is the largest employment skill in America. Those people will need new careers.
Longer term, I expect a few things. One the steering wheel will retract or hide, making it feel less weird, and probably the seats will rotate to the middle - which will bring new safety challenges.
This is interesting stuff though because it could change property prices etc, if I have a good driverless car, I can live an hour drive out of the city. I can work or sleep on my way in, that's a very different thing for the commute. If it's an office on wheels, the hour in the car with full wifi is productive.
Much longer term I agree with others the tech will allow cars to communicate via a central hub etc, there'll be driverless car lanes etc, where everyone HAS to be in driverless mode, and the speed limit will be much faster, as the cars will know if there is a problem. They'll be high speed and need much small gaps.
Eventually I'd think that most cities etc will eb driverless only, as people have mentioned the mix of driver and driverless will be the big issue. People freaking out when no one is driving, assuming they do a human thing, not the safe/ correct thing etc.
It's clearly more efficient, safer and better in the long run. The fact it should be faster too makes it inevitable for me. The question in the long term is how many will even allow a manual mode on their cars.