Currently, dollars account for about 62 percent of the currency reserve at central banks -- the lowest on record, said the International Monetary Fund.

Bernanke could go down in economic history as the man who killed the greenback on the operating table.

After printing up trillions of new dollars and new bonds to stimulate the US economy, the Federal Reserve chief is now boxed into a corner battling two separate monsters that could devour the economy -- ravenous inflation on one hand, and a perilous recession on the other.

"He's in a crisis worse than the meltdown ever was," said Peter Schiff, president of Euro Pacific Capital. "I fear that he could be the Fed chairman who brought down the whole thing."

Investors and central banks are snubbing dollars because the greenback is kept too weak by zero interest rates and a flood of greenbacks in the global economy.