The problem with this, of course, is that it involves picking an economic fight against rich people, the people who win economic fights.
Anyway. A lot of zoning policy is set by people who claim to be middle-class but own fabulously valuable property. They could become rich at any moment they choose because they are lucky enough to live in a home that has become worth about $3 million due to the housing shortage. It's in their interest, of course, to stay where they are and keep the housing shortage going until their house is worth $4 million.
If we had a land value tax, maybe people would prefer to have a sensible rate of development that kept their home price stable. But accidentally-wealthy homeowners are a huge voting demographic, on top of the fact that blatantly rich people have a lot of political influence. So the land value tax is politically infeasible.
This thread is largely an assault on the middle class in SF who happen to have been around when it was affordable to buy there by a swarm of very well salaried (but still priced out) techies who've by and large ruined SF with their presence as it is.
Like most Americans, the target isn't the rich because the techies in question see themselves as being those people someday.
Middle-class people, on the other hand, are not facing their single-family house being taken away; just some of its benefits being reduced and its value possibly dropping.
For starters, that would violate the 5th amendment.
Why should everything be balanced on the backs of the working and middle class if we're talking about architecting a more functional society.
You can believe that "densification" will be applied in-equally as well. Just as it happened to poor or working class folks who were gentrified out of the homes they had inherited, it will move up the 'class' gradient until only the wealthiest own everything.
At some point the practicality of life in a civil society has to trump insane ideologies committed only to protecting 'property rights' of a small minority.
Why is it that the middle class who only have their single single-family house are the selfish ones?
No, on the eve of what looks like the most disastrous tax policy in the history of this nation for working and middle class folks, I don't think it's the middle class who are being selfish by a long shot.