Washington Post article on "The Great Resignation":
https://wapo.st/3aBkIRF
It jibes at least partially with what I'm hearing anecdotally - a lot of people who a year ago were "essential workers" not being treated like they're essential. I'm also interested to see if vaccine mandates from some companies might have the opposite effect of what's feared, United said they received over 20,000 applications for 2,000 open spots after announcing they were going to mandate vaccinations. It would follow what I've heard from some friends in New York - the bars got more crowded after they started requiring vaccines because now people felt safer going to them.
I just saw that United Airlines say that of their >67,000 employees, 232 have refused to get vaccinated and are undergoing "the termination process," so it sounds like United at least will weather that.