Maybe Americans just aren’t dumb enough to keep buying houses?

Psychologically, a person who just lost enough money to have paid for 5-10 years of rent is not a very likely candidate to go back into the market where he was just burned.
Thus the more houses are sold, the worse the buyer-seller ratio will get. Every sale has a roughly 37% chance of removing a person from the real estate ownership market. More and more Americans will be conditioned to the idea that home ownership is a waste of time and money, not to mention the inflexibility that it imposes on a person who might otherwise have been able to get a better job by moving.
Summary: Why would house prices continue to fall then? The longer that house prices fall, the more people will critically assess whether it makes any financial sense to own and conclude “it does not”. They withdraw themselves from the market of potential buyers, at least for 10 years or so until they forget what wounds they suffered and how boring they were when they owned.