Check out the Dow chart from 1937-1939. It looks somewhat like the current market.
Kass over at the TSCM has a rational view about where the market is heading. This rally will continue up to 1000 on the S&P but will likely trade sideways for years until the balance sheet of the consumer is worked down.
Of course there are economists from the Party of the Dumb like Mankiw who suggest negative interest rates to force people to spend. So expect the unexpected.