What makes you think that this has anything to do with "the left".
market forces are driving this - a lot of industry insiders see this as the way the industry will go.
They think people won't own their cars, they will summon a self driving vehicle that will take them to where they want to go and then disappear off to the next job.
Pay per use.
The benefits are huge.
No parked cars clogging up our streets, kids could actually play out in them.
elderly, disabled or drunk people don't have to rely on other people to drive them around, it will be a great improvement on people's liberty, not curtailing it.
Super sized cities are basically happening already, whether we want them or not.