The percentage of the population claiming stock market ownership plunged dramatically between April 2008 and April 2009 by five points, and has continued to decline by more than a point per year since then as of April 2013.
Jim Cramer told everyone to sell in October 2008 on NBC's Today Show after the panic of September, saying to do so "if you needed your money in five years". Well, if you had just left your money in the market, you'd be sitting pretty right now, four and a half years later. Since March 2009 the broad market is up over 140%, and since October 2008 to March 2013 your real rate of return in the S&P500 index has been +11.88% annually.
Gallup has the story and graph here.
American investing behavior over the long haul is a contrary indicator.