If they were fired for not hitting metrics and not for misconduct, they're probably willing to rehire.
My understanding is that "hitting metrics" in these warehouses is so exhausting that most people can't do it indefinitely.
Workers are renewable for annual exploitation
Obviously, working at Amazon as an SDE or whatever isn't quite the same as signing up for the military but the recruitment strategy isn't all that different.
This is why the army uses young men for combat and why apprenticeships in trades work exist. To exploit young people
soldiers can at least be promoted. apprentices may eventually become journeymen. both provide skills training that enable you to become an independent contractor, and the higher tiers offer quite decent pay.
but for now everyone knows amazon is just a dehumanizing dead-end survival-wage job that will wreck your body, and the executives know everybody knows this, thus tfa
IIRC, there are quite a few people who work at these Amazon warehouses who are essentially nomadic (e.g. living out of camper or van), but I don't it's enough to really change that equation.
Honestly, the next step Amazon needs to do is get serfdom legalized. Then they could purchase a fief in these areas and require a customary amount of labor from each household per year.
Coupled with increase pay incentives, yeah they will come back.