I think the bigger threat is that of the BRICS nations excluding America from their system. The dollar is dying, we've spent trillions on lifesupport, and now we're trying to compete with a healthy young developing system. All the QE in the world wont make prop America up again. Its not our fault, The fiat dollar lived a good long life, now the central banks are putting it out to pasture. The central bankers have no interest in continuing to foot the bill for US economic life support. If anything central bankers are about to pull the plug on their old love affair, and run off in the sunset with a newer younger model.