Public transport was crippled during the pandemic for obvious reasons... Let's not forget that.
Also during an earthquake/power outage scenario would likely do the same, and cause far more dramatic loss of life if it was the only option.
It's a hard sell to people who want to be free and independent, and in control of their safety and time.
Getting rid of cars also means eliminating a huge volume of revenue from federal, state, and local government from related taxes... This means funding for bike lanes, roads, and even public transport, would evaporate.
Most of the busses in many major cities were also once electric (at a very high cost to cities), but now (somehow) have mostly gone back to diesel... No one is asking Why...
We still have major factories, ships, planes, and many other big business hallmarks that create the majority of pollution in the world (while the same companies try to portray that they are "green"). Conservation efforts are futile unless we start talking about the real issues, and create accountability, not if we leave rules up to profit seeking individuals and companies.
It's beyond a hard sell at this point for many people, and contradictory to the concept of a free society.
Back when we had mostly horses providing transit, they consumed more energy than cars on an individual basis too, and created health problems with their waste...
It's all just shifting the buck somewhere else, and not solving real underlying problems.