I think that's part of the problem though, as a consequence of car ownership we've normalized having a terrible commute. We can't build traffic-free cities if we're not committed to the idea.
It's still a symptom of the root issue -- sparse, car-centric cities. I live in NYC and the odds of me switching jobs to the point where I'd need to move (or purchase a car) are basically nil. Even if the only job I could find was in Stamford I'd still have a better commute than a lot of people in LA.
1. super-dense city core (your current situation)
2. mega sprawl like LA and Houston
3. traditional suburb, with long commute into a city
4. out on the farm/ranch, maybe telecommuting
5. small town
6. small city
In particular, I think #6 is what you are missing out on. By that I mean the sort of place with 50 to 100 thousand people, laid out like a suburb but not oriented around commuting to a big city. The population density would be 1000 to 2000 per square mile.
In this sort of place, commuting is easy by both bicycle and car. Traffic is seldom much of a concern. Parking is plentiful. Usually the houses are cheap, frequently 100 to 500 thousand for free-standing homes with yards. Usually the schools are good, with enough people to have a full set of advanced classes at the local high school.
I've lived in several of these in several states. My commute is typically single-digit miles. I normally drive, but walking isn't much trouble. Currently I walk less than a mile. I'll need to do 5 miles in the near future, which should take 10 minutes by car.
Small city has 0 or 1 employers that are larger than local in scope. It's fine if you are an accountant or dentist or carpenter and there aren't too many like you in town already, but what if you work in a specialized industry?
It has Northrop Grumman, Lockheed Martin, Harris, Embraer, GE Transportation Systems, GE Energy Management, FightLite Industries, Thales, Raytheon, DRS, and a bunch of little cyberwar startups.
So there is plenty related to aircraft, cyberwar, and generally all sorts of engineering/manufacturing/etc. for government (especially military) purposes.
Working in a specialized industry is fine. The city is specialized.
OTOH, moving elsewhere is not the end of the world. There are many other fine small cities all across America. You don't have to live where there is more than one job suited for you. Moving every now and then will let you experience more of America.
It's not a bad idea. There's just a few hundred million of us that don't want to live there/that way. I'm happy for everyone that does want to be there.
Serious question: what would it look like if everyone needed to live in a NYC. Of course there would be more of them, but the big cities would probably get bigger. What would a double-size NYC look like? Living somewhere so big and crowded that officials physically press/pack people into a subway car at rush hour sounds awful to me. But folks in Tokyo put up with it. Makes me wonder if it's by choice. Honestly wonder...