It is straight up delusional to believe we could just flip a switch and not have cars anymore. And I also notice you still haven’t provided an actual solution outside of “just use trains, bicycles, or walk.”
Whenever I see takes like this, I just assume they aren’t from, or maybe have never visited, America. The majority of the country was built on the assumption of travel via automobile from public transportation (or the lack thereof) to urban planning to housing. For the country to function without cars, it would require massive renovations to rebuild cities vertically, install a vast and complex rail system, and completely alter the culture of work and trade. And we can totally do this, but it will be very expensive and take a very long time, and to suggest investing in EVs in the meantime is somehow foolish because it doesn’t fully solve the problem is a bit dense. You can do both at once, not that we are, to be fair.
Fully investing in sustainable public transportation and infrastructure is something that would have to take at least a decade, even with absolute maximum commitment. So, yes, anyone who thinks that you can “just switch to trains, bicycles, or walking” is incredibly naive and absolutely fantasizing. Not suggesting it can’t be done but we have to live in reality where cost, labor, time, and public interest are factors and those make “just” doing it a bit more complex.