Comment on Federal Reserve, Quantitative Easing (tapering), Repo rate
The very long term implication of QE in theory should mean gradual devaluation of US dollar.
However in the short term there are a lot of implicit factors supporting the dollar, things like commodities or international trade are dollar denominated and a lot of dominant forces stand to gain from dollar remaining at elevated levels. Also the US dollar is considered as a safe haven of sorts to park money in times of uncertainty.