Unfortunately as the Tiktaalik mentioned, we have a housing shortage now. So the trickle-down economics of luxury housing won't work for at least a generation.
Also, all the actual luxury housing that ends up being built is bought by wealthy investors buying their third or fourth property. Just look at the housing market in London.
> Throughout all of American history, new housing has almost exclusively been relatively expensive housing.
Eichlers and Craftsman homes were targeted squarely at the middle class of their time. Now in the Bay Area, the price of a "middle class" home is probably skewed to something around $1,000/sqft, but I don't know if middle class wages can actually afford that.
[0] - https://cityobservatory.org/how-luxury-housing-becomes-affor...