Why? That sounds like hell. If I had to drive everywhere for everything I'd go mad.
I don't own a car, but I can completely understand why having the option to take one for occasional larger shopping trips is nice. Friends and family with cars do that, but they still make 97% of their trips without the car.
Soon enough what used to be a 500 meter walk turns into walking 2 kilometers because of all the car-related infrastructure in the way, which then becomes a self-reinforcing feedback loop as more people own cars, so they're willing to travel longer distances, reducing the business & zoning incentive to make things walkable.
E.g. in my hometown every building in the city core is accessible by car, but you have to take narrow, often single-lane side alleys to get there, the major paths all are pedestrian only. All that means taking a car there stays the exception for when it really is useful to do so. Tons of inner-city routes that are faster to walk than to drive. The further out you get, the more car-friendly things get, but public transport bridges most of it. Density is key to maintain that, it makes public transport and local businesses viable and puts pressure on cars.
Making large areas completely pedestrian-only isn't really politically viable, even here in Germany, but the compromises IMHO can work out fine, and people move to areas that have the characteristics they like.
As long as you are dressed appropriately then a 200m walk in the cold is nothing.
If it's snowing I almost never drive (if I don't have to) but I have absolutely no problem walking to the store, or to pick up food, or even just to get out of the house in the snow.
Remember, the proposed new state of the world is not just like the current one except that you personally don't have a car. It's one where nobody owns a car, and everyone shares the benefits of that.
The urban rich and powerful can afford to live within short walks of their offices, or right next to stations on the best parts of (small) existing transit corridors. They are most assuredly not sitting in rush-hour traffic.
>low density, partly to accommodate cars
Figure 1000 people work downtown, half of them park in 200sqft spaces, the other half live in 400sqft apartments.
Convert all the parking to apartments. Now downtown can support only 750 workers. Great for me if I'm one of the 250 who no longer has to drive, but what if I'm one of the 250 who can now neither drive nor live there?
Statistically, it was worth ~$9,000/year to me not to ride a bicycle or use public transit. Unless that was purely ignorant, starting to do so will be a bad time.
>bad zoning laws,
I'm with you there. We need to massively increase the height of buildings in the small walkable cores and along transit corridors so that more people can live in them. Over time, employers could also spread out, so that there is not a single downtown that everyone's trying to get to. And of course it is ridiculous that any one lives far from a grocery store by fiat, rather than by economics.
>It's one where nobody owns a car, and everyone shares the benefits of that.
But if we do that and, the contention for housing along the transit corridors will be so intense that only the wealthiest can remain, even with free-for-all zoning and a huge construction boom. I've no doubt that the proposed new state of the world will be awesome for the few people who can afford it, I merely doubt that I will be one of them, and I'm not looking forward to 3+ hour/day commutes, no matter how safe the streets.
Sprawl, the automobile, and the highway are fundamentally housing affordability devices. Land value isn't so important if you can traverse 10 miles in 10 minutes. When 10 minutes its half a mile, it suddenly matters a great deal.
I'm much more interested in blanketing the suburbs in fast, cheap transportation with low wait times and minimal to zero parking requirements on the urban side. Probably a combination of e-bikes, electric motorcycles and scooters, and UberPool. Then personal car ownership (and demand for urban parking) can fade because it is actually less compelling than the alternative, instead of by fiat.