But that's the current dollar-based system. Like the gold-based system before it, today countries as a whole have to have long-term balanced trade, as measured in dollars. That's what a great many countries demanded to keep the system fair. If need be, some temporary imbalances can be forgiven by the world bank, but not much.

Outlawing or taxing imports (=tarriffs) of course helps with this.

However, if you look at economic history this always slowly lead to problems that only got resolved by fresh loans (that's what the move to dollar effectively did), hyperinflation or wars.