I know how it works, but the trend to replace the US dollar as the world reserve currency is already happening, being driven primarily by China and Russia. Be it a currency basket, IMF SDRs, 'petro', or something else, they're working on alternatives. It won't happen overnight, and the effort may ultimately fail, but it would foolish and complacent of the US to count on having the world reserve currency forever. A multi-polar world eventually won't accept it, both b/c of the Triffin dilemna and balance of power games.