Disaster nobody needs. World in any case try to avoid taking extreme solutions. Rather, the "developed" countries of the North to agree in advance on how to revise the role of the dollar and the Euro, the political and financial turmoil.
Bretton & #8209, Woods solutions of 1944, monetary and financial agreements 1940-1950 and can be adjusted … But even such a mild scenario, no catastrophes and collapse will mean the end of the exceptional role of the dollar as the world reserve currency.
And it will be immediately mean U.S. decline as the most influential power in the world. As the center of a world empire.
So, anyway, and any scenario for the U.S. means a fall from his throne, the loss of its exclusive role.
This was one of the causes of events in Yugoslavia: If you do not attempt to rip, then at least to delay the introduction of the euro. The reason ice war with expensive allies.
And why not? If Iran is "lower" can be, why not Germany?
Itself war in Yugoslavia 1999 shows the extent to which the United States can not give anything to the world. They can only try to get the rest of it was even worse. And to the background of these other U.S. would have kept well.