I doubt that here. Cars are already near saturation, at least in the US.

Essentially everyone has a car. The car is mostly idle. If car availability starts to approach instant then people don't need personal vehicles that are idle 95% of the time. Car quantity overall goes down unless you can 20x current utilization, which is a lot of trips and fuel.

Not to mention that if anything resembling current quantity of extant cars becomes the current quantity of cars using roadways at a given moment, most cities will gridlock.

If the thesis is "cars will approach 50% or greater utilization" then car numbers must drop barring a massive increase in road capacity for which the land does not exist.