Did the twitter employees come back at the same pay or did they ask for much more expensive packages since they'd been identified as crucial to operations?
Sounds like the kind of thing that could end up increasing costs rather than reducing them.
If it ends up being something like 80% non-crucial and stays fired, the other 20% return with double-pay, you’re probably still running a net-positive with better resource allocation
Except in reality the 20% coming back are probably not the best. Some will be but at least some of your best employees are going to be smart enough (or have enough self-respect) to go elsewhere. And/or those are the people skilled enough to find a new job quickly (or know they can find one quickly) and aren’t willing to come back.