I never saw any fundamental reason for the Dow to be above around 7800, but what do I know? Actually, I've suspected that a lot of the Dow has been inflated because of the 401s. Too much investment money for too little production. It started looking for a place to go, and often went places that fundamentally shouldn't have been getting investments.
Looks like baby boomers are pulling their 401s from the stock market now, as they fear losing their nest eggs.