A stable recovery. The general concern (shrinking, but still present) is that the U.S. economy could sink into another recession creating a double bottom recovery pattern (as opposed to a V shaped recovery)(Spencer 2009).
The U.S. Congress has done a good job at not spooking the markets. If the markets believed that the Fed would be raising the interest rates, the economy could slip into another recession.
Ben Bernanke has promised to keep interest rates "exceptionally low for an extended period of time." As we move past the point.