One, maybe not the only one, hands off, automatic, 100% "all-natural", do nothing solution to the "housing crisis": Hope the birth rate, i.e., on average the number of babies born per woman, stays significantly under 2.0 or even 2.1, maybe 2.2.

So, the population will shrink but with some maintenance (roof, painting of exterior siding, kitchen/bath, HVAC, windows/doors) mostly the housing supply won't.

The Internet may reduce the time and money commuting to work and/or the need to be in high density, expensive housing areas for a job.