China is vying for power and recognition as the world's super power and will push the Yuan as the new international reserve currency. During this time we should expect the United States to engage in a significant military conflict which will further devalue the USD.
Excerpt from: http://en.wikipedia.org/wiki/Reserve_currency#Call_for_new_major_reserve_currency
"A report released by the United Nations Conference on Trade and Development in 2010, called for abandoning the U.S. dollar as the single major reserve currency. The report states that the new reserve system should not be based on a single currency or even multiple national currencies but instead permit the emission of international liquidity to create a more stable global financial system.
Countries such as Russia and the People's Republic of China, central banks, and economic analysts and groups, such as the Gulf Cooperation Council, have expressed a desire to see an independent new currency replace the dollar as the reserve currency.
On 10 July 2009, Russian President Medvedev proposed a new 'world currency' at the G8 meeting in London as an alternative reserve currency to replace the dollar.
According to economist Michael Hudson, China has said, "we don't want to make any more foreign exchange reserve of any paper currency, because all the paper currencies are government debt currencies." China, Russia, India, Turkey, Brazil, Venezuela and oil-producing countries have recently agreed "to transact all of their mutual trade and investment in their own currencies" effectively minimizing the need, at least in the short term, for a global reserve currency. And yet oil is still priced in dollars, which has brought complaints about OPEC's policies of managing oil quotas to maintain dollar price stability."
Regarding the USD losing its place as the reserve currency: that may happen, but it is unlikely to occur in the next few years. It may not happen in our lifetimes and it will certainly not be a sudden event. You may want to consider that before placing a large bet.
Best of luck to you in your trading.