> So I see 553,742 people homeless at last estimate (2017, unfortunately). 11M would 20x this amount, an amount that seems catastrophic and unmanageable.
Not people. Households. 11 million households. Different metric.
So, if you want to convert to people, you have to break that down into an equation where the ratio of households reflects their diversity: single, children, extended families, shared accommodation, collectives,... Plug 11 million into that equation and the output will be a magnitude of several orders of that.
The U.S Census data shows an average household in the U.S. having 2.63 persons between 2014-2018. So, a ballpark guestimate would be 28.93 million individuals.
However, this could still be way off: if evictions happen in highly populous areas, or coincides with areas where the demographics show large households, you'll get a much larger number. For instance, California has, on average 3.1 persons, whereas North Dakota only 2.1.
To put all of that into perspective: There are currently 37 million Canadians. So, basically, the problem probably entails a group as large as the entire Canadian population.