If the dollar ceased to be the global currency, how would that effect the United States?

On March 24, 2009, Zhou Xiaochuan, President of the People's Bank of China, called for "creative reform of the existing international monetary system towards an international reserve currency," believing it would "significantly reduce the risks of a future crisis and enhance crisis management capability." Zhou suggested that the IMF's Special Drawing Rights, a currency basket comprising dollars, euros, yen, and sterling and could serve as a super-sovereign reserve currency, not easily influenced by the policies of individual countries. US President Obama, however, rejected the suggestion stating that "the dollar is extraordinarily strong right now." In the G8 summit the Russian president revealed the world currency.