Once we lose the Reserve Currency Status, quantitative easing for our and the world’s debt will no longer be a valid option without hyper inflation ensuing.
This is an earlier post explaining what Reserve Currency status means for US.
http://blogs.reuters.com/great-debate-uk/2009/07/03/g8-signals-end-to-dollar-supremacy/
http://www.getmoneyenergy.com/2009/07/us-dollar-reserve-currency-status-china-russia-india-japan-g8/
http://www.zerohedge.com/news/india-joins-asian-dollar-exclusion-zone-will-transact-iran-rupees