What magical unicorn of a place have you worked at that could survive multiple entire teams quitting at once? Do you think the induction manuals literally jump of the shelf and explain themselves to the new hires that there isn't an HR team to hire, a security team to grant their access and a department to welcome them?
This is like the flight crew being raptured. The plane is going to crash.
This is the ground crew being raptured, the flight crew all exploding, the plane had an engine removed "to trim the fat", the company who sold you fuel pulled out of the deal, everyone on the plane who has ever played flight simulator dies and is replaced one of those people who know just enough to fuck up.
All could, and one of them passed through full employee replacement when it failed to raise a round of funding. They would have to suffer and hire good people, not miscellaneous cogs, but they would survive.
This is like the flight crew being raptured. The plane is going to crash.