Old Geezer has just described the basis of the FIAT currency system.
I think it'd be foolish to sell much gold right now, China's currently backing it's currency with commodities (most notably silver) but gold too, Malaysia and Indonesia have introduced a gold currency to protect it's people against a collapse in the U.S dollar, Russia has it's oil and gas to back it's currency.
C.I.S countries are heading towards using the rouble in all transactions, and Russia is pushing for oil to be priced in roubles too (I think Venezuela is backing them), it's only China that is keeping America from a currency collapse, it holds billions of dollars worth of U.S bonds, if it dumps them the dollar will crash.
And yet some American economists want to place greater import duties on Chinese goods (the prelude for the last great depression) whilst others complain that the Yuan Remnibi is valued too low (yet the dollar's been undervalued for years) if the Yuan is allowed to float then China will become all powerful economically.
The whole international finance system needs to reworked, the ratings are all skewed and unreliable, interesting times....