I'm not sure the relevant question is whether they stay or don't stay. I would think the more important metric would be, "What is the perceived impact".
Last time compared to this time......

You are talking 2 years not 5.
You are talking massive retirements vice paltry retirements
You are talking current massive hiring compared to virtually none before due to economic malaise.
You are talking great wages compared to 46% pay cuts.(pro and/or con...cuts both ways)

To me, the concer may be the same(stagnation) but it won't play out like last time. It would be more of a slowing of hiring and progression.... might not be the current "Full speed ahead", or "Flank speed ahead".... but more like " Half ahead, both engines"