That's for sure. Are you a prepper? ^^
I think that's true if all fiat crashes. If it's 'just' the USD, then the people might use other fiat. If all fiat crashes, we're doomed. Move to the nearest farm and be sure you've got enough guns & ammo. And some protecting gear. Maybe landmines will be usefull then.
I hope we won't experience such situation ever.
There is no scenario where only the USD collapses. I don't understand why people (not you) think the dollar can collapse and everything will go on in an orderly fashion. A collapse of the dollar would have systemic impacts that would damage the entire global economy.