I realized there's going to be a hard limit, impossible to get around, that will be "REOPEN THE GOVERNMENT OR YOU HAVE BIGGER TROUBLES". And that's when enough ATC folks just up and quit (because they're being forced to work without pay, which means they're paying for transportation and other stuff that they can no longer afford and keep the roof over their head) that they have to close at least one major hub that supports at least one major shipping company (doesn't matter much which one) because it's no longer possible to operate the airport involved. At which point, we're probably already past the tipping point where the economy is crashing, and crashing hard enough it's not a recession, it's a Depression.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor