If a currency collapses it has to have another currency to collapse against.
There is not another nation or currency with the strength to challenge the US and the US dollar. If there are problems I see it as the dollar becoming too strong compared to other currencies.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
gisd O
Like Dowd commented, everybody’s debt is dollar denominated (reserve currency) so as the crunch comes, the dollar is going to “fail up”.