Can we fix polluting vehicles first?
https://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/pu...
You can argue that you want that rate of improvement increased, but progress is being made.
Self driving cars, owned by faceless organizations can be silently converted after the fact, effectively subverting the psychological ploy of keeping-up-with-the-joneses style peer pressure, which has held a death grip on the lifestyles of puny materialistic mortals for decades now, as demonstrated by beer advertising, cigarette advertising, vacuous fashion trends and so on. In fact, apply this principle to pretty much every bad habit you can imagine.
I think most of us can't afford to take out $10,000-$250,000 loans to replace working assets we already own that have 5-10 good years left on them.
You could own shares in such a company, purchase a subscription to summon vehicles at a rate, or buy a vehicle and resell its autonomy, offsetting the expense. One might view some of these options as a form of collective ownership, and so it might not just be you owning one on your own, but maybe contributing to the partial ownership of one or more vehicles.