I know that's the sales pitch, but does the economics actually work out that way? You mention subsidized ride hailing, for example.
> (personal cars are utilized <5% of the time, while self-driving cars can see >60% utilization)
How much of that 5% is commuting, though? If there are two one-hour long windows in the day where a lot of people want to make the same trip at the same time, the fact that cars are idle in the middle of the night or day doesn't help with that. And that's also going to be peak surge pricing time.
The time economics gets worse in non-suburban areas. In high density urban areas, it's already too congested to not take public transport. In very low density areas, you might hail a ride, but you've got to wait for it to become available and arrive.
> Self-driving is proven technology, see Waymo.
Only in certain locations, and still dependent on occasional remote operator intervention. Tesla have been promising for years and not delivered, and every year they don't deliver makes it less likely that they ever will.
I think there's room in the market for such substitution, but it underestimates how much people love their cars as a form of personal space and personal brand extension.