i am more dubious about it on technical grounds, not regulations.
I am familiar with the details of GoogLeNet, which is rumored to be the prototype for Tesla's AP networks. I am also somewhat familiar with autonomous flight work. And i am fairly confident both are too weak to be the FSD basis. The fuzzy nature of this technology makes it almost impossible to assert its accuracy in any given never before seen situation.
To add, I have even more doubts about society's readiness to accept FSDs even if it works (meaning it being safe and rational).
Even though my AP technically does nothing illegal, i can "feel" the situations when a driver next to me is going to be irritated by its action, so i take the car off of it. It simply does things human driver would rarely do exactly that way, and most humans are not conditioned to expect that. They expect other humans to cut corners, adjust safety margins depending on overall congestions etc. etc. If AP is to be safer than humans, it is bound to do things that human drivers do not expect a driver to do.
Note that neither Waymo, nor Tesla ever actually sent a car without a person at the wheel to the public roads. That happened only on private roads in a controlled traffic. Why is that? What are they more afraid of, that their vehicle fails to behave, or of how it will affect behavior of other drivers it shares the road with?
Waymo is already experiencing vandalism and hate issues even with their small fleet to-date, imagine what happens when FSD without a real steering wheel or person reaches even 10% penetration. Human road rage may become an issue, in which case i doubt the regulations would be able to stem it (unless humans are banned from driving entirely; but then we are looking at something like the `i,robot` reality
with even more unforseen human response).
So it is possible that we will see regulation finalized. But will the manufacturers really ever dare to put out a car without steering controls on public road (or otherwise completely indemnify the user from being responsible for driving errors)?
On that note i want to say that I am happy to turn out to be wrong. It's just a long standing concern of possible problems, not a conviction (much less an attempt at prophesying).