Might it be that insurance companies have a lot more say about it than the government? And, besides, I remember the debacle concerning the flame retardant for children's clothing, (sorry, the names just not coming to me). It mandated that a particular flame retardant be used in all children's clothing. Until it was discovered that it was an extremely high carcinogen. Then the Mandate was, no surprise, no clothes can have that! The problem with government involvement is it tends to be based on reelection possibilities.
Very incisive! Once it is established that limited "auto-pilot" features actually reduce accidents, insurance companies will adjust their rates accordingly. When there are cars capable of intervening and taking control away from the driver to prevent accidents, and it is established that these also reduce accidents, insurance companies will adjust their rates accordingly. And once there are fully-autonomous cars being sold to the public, insurance rates will again be adjusted. At each stage, you can choose to drive a safer car, or you can choose to pay higher rates than the computerized cars.
I will never set foot in a vehicle that does not allow emergency intervention 100% of the time.
I, too, would refuse to ride in a car that is not capable of taking control away from the driver in an emergency, once such cars become available.
Altogether too many people are looking at the whole issue backwards: They think of all the situations when (in their usually-mistaken view) they could prevent an accident better than a computer could. The correct way to view the issue is: How many people die because of human drivers, vs. how many people would die if computers drove our cars. There are roughly 32,000 traffic deaths a year at present. If autonomous or partially-autonomous cars eliminated 30,000 of those deaths and caused 2,000 other deaths, that's 28,000 lives saved. But few people are capable of correctly assessing risk, and fewer still act on such a correct assessment. People want to feel in control, and altogether too many people feel that 32,000 deaths a year in the U.S. alone is an acceptable price to pay in order to remain in control of their car. I have the same emotional reaction; I just don't let it govern my choices. I am more frightened to ride as a passenger in a car with a driver who is clearly a better driver than I am, than I am of driving my own car. But I know that I am safer with that person driving. I am scared to fly, but I fly anyway, because I know it's the safest way to get where I want to go.
I agree that U.S. lawmakers tend to oppose regulations until those have been very clearly demonstrated to save lives, and that they are unlikely to mandate the retirement of older cars, but it would be the logical thing to do, or at least outlaw the manufacture of new non-autonomous cars once the technology is established. But what government won't do, insurance companies will not hesitate to do: Charge according to the actuarial tables.