>What happens next?

We'd revert to the state that applied for most of human history: 99% of humans will be serfs renting from 1% hereditary landlords. We'll have shown the American mid-century home-owning middle-class phenomena to be an historical anomoly. Average living standards will plummet and equity barons will never have lived so well. Any short-term rental rate drops will quickly be erased by a combination of growing population and well-known market manipulation, in particular further wealth consolidation.

Mere millionaires think they are safe; they are not. We live in a world that has a ~10 OOM wealth scale; being at level 7 does very little to protect you from 8s 9s and 10s, just as 2s are powerless to 4s and above. To a 10 a 7 may as well be a New Dehli beggar.