it's not limited to the magical printer nor us satellite states (like japan or the uk) buying debt bonds from the mutts. a large chunk of energy trade (oil for example) is made with dollars. but that's not the biggest thing. something along the lines of 60% of the world's states reserves are in dollars. states won't just dump their billions in usd randomly because they're indirectly tied to it. hell, russia had foreign reserves in dollars. china does. it's against their own interests to devalue the currency as it'll hurt their own capital. to crash the dollar, you first need to establish a strong competitor that's viable enough for people outside of your area of influence, and tie it to some important trade (like russia and china are trying to do with oil, for example). then you need decades for the countries not using said currency to exchange the dollars they do have as reserves into your currency. it's not a fast process. sure, their debt can lead to devaluation of currency, so can high inflation, loss of confidence in the dollar (us is kinda doing that), reduced reliance on the dollar for international trade, national banks diversifying assets, etc.
Romania