Allow me to say first of all that I agree we should have denser cities/towns, better public transport to get around, and we should all use it more. But some stats (no citation, these are rattling around in my memory, feel free to fact check). 90% of cars are not utilised 90% of the time. That is insane wastage for energy intensively manufactured, expensive pieces of equipment. 1/3 of city centres are dedicated to parking (probably a US stat). Huge amount of valuable land unlocked.
Imagine unlocking that capital and land inefficiency. Then imagine cars halve in size and drive bumper to bumper and twice the speed. That could be a 2 x 2 x 2 improvement in commuting.
Don't get me wrong, even if we grant the pessimists on FSD that it won't be till 2100, that's a huge prize to be aiming at.