Will those Resorts and Points Systems cut back on Deed Backs as the group they can sell/pass them on to dries up...
I personally don't think that there is really an accurate "one size fits all" answer to this question.
In instances where HOA's can
rent out decent HOA-owned weeks accepted via "deedback", why change practices? (if / when travel becomes an option again, of course). Some HOA's can temporarily make decent weeks almost self-sustaining (or better) with rentals (again, if / when travel becomes an available option for people) until ownership is (hopefully) taken over later by a new grantee. HOA-owned "dog weeks" are of course a very different kettle of fish and are just a financial albatross, in
either good times or bad.
Wastegate charges $900 (or more) to accept deedbacks; seemingly a money making practice in and of itself. DRI collects a hefty fee for their deedbacks as well. Such deep pockets corporations can easily absorb (and then also likely "write off") a temporary downturn. Those places / chains that already refuse to even consider accepting deed backs will plainly just continue with that policy.
There are just far too many variables for there to be one, single accurate answer here.