The logical conclusion is that the residents of these desirable areas like the bay / San Diego / Seattle / DC actually want housing prices to stay high.
Repealing all the bullcrap from the last 50yr that makes that artificially expensive to the point of being a non starter if not outright illegal is the hard part.
Also doesn’t help there’s a lot of red tape as the other commenter mentioned.
I live in a former socialist country (well, part of a country, the country does not exist anymore), and when we needed more housing, we designated the land in the city to be for housing, ie. large socialist buildings. Then 1990s came, no more socialism, capitalism now, and no more large building projects, no new neighborhoods. So now, we have cows and cornfields in what would be prime realestate because the government won't change the zoning, all three neighbors there complain and apartments that used to be 120k eur maybe 20 years ago are now close to 500k eur.
If you want to live next to cows, move to a village, thousands want apartment buildings there, to live in a city.
The government steals half of my money, half of my landlord's money, and I have to pay my landlord’s income and property tax in addition to my own income tax.
This is why I still cannot afford a home even though I work in a senior role in AI. After paying all those damn taxes and everyone else’s taxes there is almost nothing left.