The US has a pretty great track record on what happened to the last few people that decided to try to not use the dollar as a reserve currency, as is the subject of many memes. "can't afford its military" does a fuckload of good when they're in your face. The traditionally method of affording one's military was to pay them the spoils of war. Of course that requires engaging if profitable war. Not that I approve of this mode of operation. The thing I see with the dollar right now is, sure you don't trust the US government, but who do you trust better? The smart money tells me China is on the brink of economic collapse. Eurofucks? They're not any better disciplined than the Fed, and they have a lot less to back it up. I guess if you're arguing for a global economic collapse you could say all fiat currency is going to become trash. I'm not sure that's ever happened. The Great Depression was bad enough times but short of a collapse of the entire world economy.