Iirc, didn’t the article say that was one of many hypothetical scenarios they try to plan accordingly for? Like you said, it’s been awhile since it came out, so I could easily be wrong. I imagine it won’t be a problem any time soon, though. There are always desperate people, and simply changing policy to allow rehiring people that had previously been fired/quit would open eligible candidate pools back up.

Or, y’know, they could just make working there not be miserable.