Of course, that is mostly paid for via massive amounts of debt, not from savings of military spending. But government spending on healthcare is more than twice (2.5 to 3 times) that of military spending. So slashing military spending to zero would just mean the amount of government-provided healthcare spending could go from 47% to 56% or so. (Not taking into account that a lot of "military spending" is actually healthcare spending!)
It would devalue the dollar a bit but you can print new price tags.
Just create a new similar shit coin
Single payer would be drastically cheaper than the current system.
The other benefits are just policies that slightly reduce GDP per capita based on a first order analysis.
We are able to afford so many other subsidies, so unclear why housing would be different.