Earlier quoted context omitted.
Without people to buy from, money is worthless.
Sometimes it's fun to realize that if we all just decided dollars were worthless, they would be. There'd be nothing the government could do about it. Crypto ain't it, though. Even the better-scaling blockchains still don't scale very well. I've heard of a few different mesh-network currency projects, and I wonder if any of them could scale by essentially giving each user their own blockchain. However, in a mesh-netwo…
If the government requires taxes to be paid in dollars, that sets a "floor" on the value of a dollar as a medium of exchange - for most people in the US living a "normal" life, you have to acquire some amount of dollars throughout the year, under penalty of jail/loss of property (property tax). Then, since you already have 300m+ consumers in a massive market using the currency, odds are you'll use it too.
The only way you'd truly render dollars worthless is through government action or malfeasance; the fictional scenario where every person on earth not only agrees dollars are worthless, but also agrees to forfeit all property in the US, all employment in the US, and interests in any US financial holdings is quite a few steps beyond the point where "the people just decide to rebuke the dollar's lack of backing".