Big picture, there will be as many housing units and as many people in 2021 as in 2019. Landlord won't evict people, unless they know they can get new, better tenants. So, if 2020 made us poorer, I'd expect lowered rents rather than fewer people housed.
Also I have never seen rents fall in my lifetime. I’ve seen rates of growth slow, but never seen prices actually drop.