Paper backed by precious metals is the only thing that is real. The current one leads to wars, and government encroachment on everything.
In the past governments were kept from going into needless wars by the reality of dough-ray-me. They had none to buy ships, guns and soldiers. But with your suggestion they just have to print more. Remember the Weimar Republic and the Continental.
Leaders within empires always encroached upon everything, and empires always made big invasions to get more money when their's started to run low. Doesn't mean it has to stay that way, but you will never find the solution when you ignore this fact. If Gold is the international currency, then whoever has the most gold-mines will have the most money. If a country has less gold-mines but the power to acquire more, then they will do so, the same as with oil now; and the same as with Rome and Gaul in the past, ETC..! Except that now, people might be able to find out how many resources a country had, and then they would call this 'USA Gold', 'China Gold' etc, and they would still be worth different amounts depending on what useful resources the country had.
As long as everyone can keep up with calculating the exchange rate between currencies and the actual value of a currency, I don't see why it would matter how much a currency is worth relative to the numbers. When people print more money without gaining resources they are just fiddling with the numbers to make it look like they have a different value of money than they really do, it doesn't change the value they really have. VALUE of money is still based upon resources like food, oil, and whatever else people need or want.
Changing the numbers is just to make people spend more, or to trick other countries into selling stuff to them for a lot less than the numbers suggest. This is a desperate attempt to try and kick-start the economy somehow, and take it out of decline, to try and delay people's perception of the decline long enough for something to change, or to do something about it, etc. The decline is a decline in value, due to a decline in resources available. If the decline continues the country must secure more resources, which adds value to their currency, BECAUSE THEY ACTUALLY HAVE STUFF TO TRADE.
When another country accepts payment from the USA, they expect that they can use that money at a later date to purchase something of similar value, but at a time when they have more need of it. As long as the country accepting the payment is aware of the TRUE value of the dollar, and the actual resources USA has, it is no problem. Money is an 'owe me one' for resources. It's like if I pretended I had 1000 apples growing in my orchard but not ripe yet, so I asked you to lend me 100 apples, since you have 1000 already ripe apples, and I wrote you a piece of paper saying I owe you 100 apples, and really I only had 10 apples.