If you have a family and still need to drive your kids to school everyday, because schools are too far away to walk and there's no bus (typical in California), if you need to drive to go to the grocery store, if you need to drive to do everything in your life, then working from home in a less dense area might still involve a very similar amount of driving.
Once vehicle miles travelled is subtracted out, the biggest impact from living in less dense areas is deforestation, reduction of large fauna in ecosystems, etc. A classic example of that is the Santa Cruz Mountains, highly populated by low-density living, but getting in and out is so arduous that most people do not commute much, or even leave their houses for much. A good life for hermits, but it's not for everyone.
School may be hard to avoid driving if there's no bus or good walking/biking routes, but maybe you can carpool with neighbors who have kids in the same school.
But I think fundamentally a lot of people are just not accustomed to sitting at home. They feel cooped up, and bored. That's not me -- I'd rarely leave the house if I could get away with it. But I know a lot of people feel that way, if they didn't have to go to work they'd go drive somewhere just to be somewhere different for a while.
I would love nothing more than to live in a walkable neighborhood, with very few cars, that lets kids roam free without fear of them getting killed by drivers. But that's really hard to come by anywhere in the US.
But if you get enough people in one place, you’ll get entrepreneurship.
WFH and H-WFH would be broadly popular among the electorate and could probably take off with just some changes to the tax code.
Presuming everyone does want to live in a dense area (I do not), building housing and infrastructure is expensive and at the end of the day it has to be profitable to build. We don't really have the framework to zone municipalities at the Federal level. So now you are talking about leaving it to the individual states... and I think you can see where that goes.
Given all that, yes, fewer miles driven in aggregate is a good and easy win for the environment. Less gasoline consumed, fewer tires and brake pads consumed, less work clothes bought, less meals purchased at lunch, etc.
I wish we stopped subsidizing wealthy folks choosing to live in low density areas. It is intrinsically regressive that poorer people living in sustainable denser areas are subsidizing the infrastructure of the low density suburbs where richer people live. Low density suburbs do not raise enough taxes to support their own infrastructure, from roads, to water management, to electricity, etc.
Want to live in a single family home? Great! But don't expect people poorer than you to bear the cost.
You are painting with too broad of strokes.
I wouldn't even considering cycling given the speed of cars around there. The local road is used for through traffic despite being one lane in each direction. So it's very frustrating if I want to get somewhere during rush hour, and this is just cars!
If you want to walk to the local gas station, you might have to deal with muddy ground because of the ground being the bottom of a hill in order to get there, although the owner of said muddy ground have filled it in with dirt lately. The sidewalks if they exist, are discontinuous.
Yes, wealthier people live in SFH and the surburb, but it's a questionable in term of quality of life.
I visited the city. In some way, they are more convenient such as access to rideshare scooters and bikes, but also dangerous and automotive centric if less so.
There's no way you're saying this with a straight face, right? People move out of the city because it's significantly cheaper. Rent in a nice two bedroom "downtown" is $3500. You move 15 minutes out of there and you can get 3 bedroom house for an $1800 mortgage that'll never go up.
Source: I did that. I got tired of paying such a huge chunk of my income for living.
We've gotten more traction building apartment complexes on the edges of the burbs than in the metro area in recent years.
It's impossible to build if there are restriction on permitting and construction. Also, I would expect land cost to be a significant factor in high density area due to high demand.