There is already an order of magnitude more unused housing than unhoused people- the problem is that the market is involved and that requires winners and losers.
That's why you have people dying of exposure in the richest country in the history of the world. God damn america.
Are the homeless people where the empty homes are? That's the concern I have. There are really cheap empty houses throughout the country, but the homeless are congregate in large groups in some of the most expensive states/cities in the country. I dont think there are that many empty homes in San Francisco that are available for rent/purchase that are just being left empty for months at a time.
It's off the aggregate numbers. I'm sure that there's a lot of useless suburban sprawl pumping the numbers up. The "most efficient system" is an abject failure when it comes to housing people unless the only metric you care about is revenue generation for shithead inheritors.