Well, there are a lot of things that could happen. If antibiotics are no longer effective on some major diseases the population could drop.
Some new discovery could create an employment bubble for a decade and hold the wolves at the door for a while longer.
I know this: It is possible that my greatest skill -- not needing much -- could come in handy.
I doubt that the US govt will do much more than let the market sort it out. I mean, the govt will indeed do a little, but not much at all.