I'm not sure why it has to be that way. Build more houses.
Building them in random lots in Florida or upstate New York is exactly what builders were doing in the runup to the financial crisis.
Building them in already-dense places is always tricky because of NIMBYism
Further, when I downsize — even in the same real estate market — that too is equity working in my favor independent of appreciation.
Without the appreciation (and leverage multiplying that), buying housing would be nowhere near as good an investment. (As it stands today, it's phenomenal, of course.)