Have none of y'all heard of rental cars? Just a few weeks ago, I missed my morning flight from SF to LA and was told the next one wasn't until later that night, so I opened my phone, booked a rental car, took a Lyft to the pickup spot, and just drove myself the rest of the way down for the weekend.
I would imagine that a world in which fewer people are buying cars would also lead to one in which there are more options for different lifestyles. It wasn't that long ago that the idea of randomly picking up an electric scooter off the street was a novel one. Now there are multiple unicorns putting them everywhere. Getaround/Turo/ZipCar are already things, and I imagine they'll just become more widely adopted/less expensive in the future.