1. Houses are unaffordable for many Americans. To get houses to prices where they'd be affordable again would require a housing prices drop that would likely be, market-wide, significantly low enough to put a ton of people underwater on their mortgages. What is society/the government meant to do about that? Is it an insurmountable floor on how low we can get housing prices? That floor feels very close if so.
2. We've been promising the last five generations (or more) of Americans that a house is an Investment, capital I, an excellent place to keep your money. How do we overcome the political pressure to turn a house into a depreciating investment for the length of time required to get housing to be affordable again? What kind of politician would put their neck on the line to piss off every boomer and 75% of gen X and 30% of millennials, or whatever the house ownership distribution is?