https://twitter.com/issiromem/status/1557816668604141568
What your friend has observed is what happens when you keep it bottled up for years and years.
Instead of gradually moving to 4-plexes and 3 story apartments and narrow townhomes, when all that demand finally gets unleashed, it's a larger change.
Change can be disturbing, so we should aim for more frequent gradual changes than 'quantum leap' type stuff. That said, at least your friend has options in that their land is probably worth a ton of money now and they do have the possibility to get out and go somewhere more to their liking.
Tons of people in high cost cities like Seattle have no home at all due to housing costs.
It’s more important to me that people have places to live than that existing homeowners everywhere can have a neighborhood that never changes. The two are incompatible. It would be preferable for that change to be gradual, but given the current state of things I don’t see how that’s possible.