But we have other types of driver assistance for that as well. For instance, parking assist has to handle the complex maneuvering of a vehicle into a narrow space. Presumably while both avoiding hitting the cars near it which are parked, but also any cars which might come across your car while it is parking.

I could see driver assistance eventually move to a point where it's tracking and simulating just as much as a fully autonomous vehicle, but allowing the driver to remain in control until it believes a collision is imminent, or that the user is making an unsafe judgment call.

Things like the automatic emergency braking feature will eventually learn how to detect different types of objects as well. Say, to avoid slamming on the brakes because a plastic bag was pushed by the wind past a camera or sensor.

Presumably, these currently independent assistance features will converge over time, into your car simply being aware of it's surroundings and intervening to protect you. And then someday it'll just drive itself.

All of this can (and probably will) be done gradually, but it sounds like that isn't fast enough for Urmson's son to reach driving age.