Some people dream of the day when a mass of millions of people quitting together will shake the big employers to the bone. That will show them. It's almost a dream of "workers of the world, unite!".

The thing is, if 40% of people plan to quit, they won't quit at the same time. Maybe 5% will quit in August, let's say, and the rest will decide to wait a bit and see. And they'll see how those 5% don't quite find a job the next day, as they thought they would. Most (if not all of the) large companies can function for quite a while with 5% fewer headcount. So those 35% in the wait-and-see bucket will wait a bit more. Which is a different way of saying, they will change their mind.