I grew up in a city of 2500 people, with vast distances. Of course people used cars for much, and no public transport. But the city centre was designed such that you parked your care one place, and then walked between all the stores. No having to drive through a big parking lot and crossing a street to get to the next store. I lived about 2km away from school, and biked, skied or walked every day, since it was designed a path for that. That path/road was completely separated from any roads cars would travel. So very safe. No one I know of got driven by cars to school.

Ironically, those making it unsafe for kids to walk to school, are parents driving their kids being short on time.

Point being, I have not only ever lived in dense urban environments. Secondly, that even those non-dense are perfectly viable to make safe for humans, and use less cars.

I think this highlights the best path forward. Large-but-not-Manhattan cities should eliminate cars in the densest areas of their downtown, where it makes sense. Jersey City did this in their downtown area, and it seems to be going well.

As people who want to live without cars move to the downtown zone, the area adapts to meet their needs (in terms of the types of stores etc). If the policy proves popular, the city has the option of spreading the "car-less" zone as the dense urban core grows. Similar to suburban sprawl, but inverted, I suppose.

People are addicted to cars and will never consider using anything else if you let them. In Australia this is true also. I have never owned a car here, lived in 4 different cities. Never needed a car. But most others think they need to.

I grew up in a country town. No car = no life.

Now I live in Melbourne. We use the car very little but would never be without one. I have too many friends in the country and without a car you aren't getting to them without hassle and $. And so the balance of convenience vs cost means we keep the car.

And I wonder how deliveries (especially furniture), emergency vehicles, and people with disabilities are impacted.

The first two aren't cars, so that's easy. You don't need to absolutely eliminate vehicles. For disabilities it's more complicated but at the very least you've already cut 90% of traffic.