You keep repeating over and over that the world is "short US dollars" (implying there is a permanent demand to satisfy the shorts as a counter party).  The world is not short US dollars.  Those are called unserviceable debts.  When people have no intention of fulfilling those contracts, those are toxic assets and not shorts with any type of counter party.

On the other hand, when you see places like Comex running unallocated, fractional reserve gold at 100:1 or more, those actually are shorts because the demand on the object for which they are attached never goes to zero unlike the bond market.