You raise some interesting points bordering on the philosophical.
I've given the transition to fully autonomous vehicles a lot of thought over the years.
I assume full autonomy is guaranteed in the long run, and that it will be forbidden for humans to operate automobiles. (Insert Elon's elevator analogy
)
However, I don't believe the transition will be as sudden as some believe. A full ban of human operation of vehicles is far far away, and will require the FSD-tech to be widespread among car manufacturers.
Also before a ban is in order - even in a small(ish) region such as California for example - the ban could quite possibly be imposed per person. I'm imagining the possibility of (at first) imposing "manual driving bans" on convicted drivers in Court (after DUI, road rage, hit-and-run, heavy speeding, causing a heavy collision, etc).
This would be similar to the withdrawal of ones driving licence we know currently, which prevents you from driving for a set amount of time. In severe cases, a permanent driving ban can be imposed by the Court (currently, in Belgium at least, but this is most likely similar in US/EU). Once FSD is available - even in few brands (cough TSLA cough) - the current driving-ban-system can evolve into forcing FSD on certain people (bad drivers), to increase overall safety on public roads.
This would be similar to the "alcohol lock" a Belgian judge can impose upon a heavy drinker, meaning you are only allowed to operate a vehicle equipped with a built-in alcohol test (by exhalation). Said vehicles can only start their engines in case of a negative alcohol test.
The more I think about it, the more logical it becomes: the FSD revolution will start with forced FSD (besides all the voluntary users of course). Then the flywheel can gain speed and one or two decades later the permanent switch can be made to FSD all around.