The problem with shorting on such convincing news is that the USD already broke down the BLUE Support 1 month ago in August 2012, and is at the Support area following the news. What does this mean? It may mean a massacre of the majority of market participants who view QE3 as bullish to financial markets and USD as bearish (including the high profile Daryl Guppy etc). Is it really the case? This had already been absorbed 1 month ago. The 5% insiders are always ahead and now doing opposite of the 95% who depend on news to be on the wrong side.
It takes a lot of guts to be a contrarian of the market currently.
USD Supported means Financial Markets Resisted.
USD Bullish ==> Financial Markets Bearish