Western Europe is densely populated and has passenger railways since 19th century. Bus service (of sorts) started in Paris in mid-17th century.
I'm not saying you're wrong, it's just going to be nearly impossible to convince people when lunking masses of steal around for no good reason is such a large part of their life.
So the math is for an already decently non-car centric country.
- If you don't live in a big city, public transportation is far from enough
- When you want to go on vacation you not only want to travel from A to B, you also want to be able to transport all your stuff and not be bound by infrequent scheduling, and you want some kind of mobility freedom at your destination
- For your bi-weekly grocery shopping you need to be able to haul a few dozens of kg of stuff that takes something like half a m^3
For all of those, there's no easy alternative, and I understand why people used to this way of life don't really want to change. Bikes can replace some of it, electric bikes even more, and why not electric cargo bikes. But it's still very expensive, especially when you can't totally replace your car. I think the intermediate solution will be some carsharing solution, where 1 car is not owned by 1 person or 1 family but shared on average with a few families, accross a whole city.
Vacation: hobbies that require hauling a lot of gear to remote areas only became feasible with a car and might become a thing of the past, like hunting from horseback. Maybe you can rent a SUV only for those time you need it instead of using it for bringing kids to school.
Bi-weekly shopping: before corona, I walked to the nearby shops every 3 days or so. To limit exposure to mask-less shoppers I am now using a hand cart for bi weekly shopping. If you live farther away from shops, a cargo bike might be an alternative.