We are all in this together
After the dollar gave up the last appearances of gold backing in 1971 (Guha might have only been a child then) the world basically accepted a system based on the capacity of their governments, or politicians, to guarantee some sort of financial discipline and which so clearly amounted to an act of faith that it was made explicit by including the "In God we trust" on the currency.
In this respect if the markets come to completely lose their trust in the word of the US governments and their politicians this does not necessarily imply that they will have more trust in the word of other governments or politicians but it could in fact lead them to lose their confidence in all of them, at which point the dollar-yen-yuan-euro value becomes utterly irrelevant, leading to a global scramble for assets to barter, at any price, and perhaps having the prices of the shares on Wall Street quoted in ounces of gold.