I predict that over the long term that the markets will remain flat overall unless they go up or go down. :-D
There are a lot of moving parts here. The boomers are taking money out of the market but IMO more importantly the money supply is grossly over blown with U.S. QE being followed by EU QE. Too much money means crazy speculation. At some point a lot of the play dough will have to be reeled back. The only reasonable play is careful diversification and avoiding the ever coming stream of new contraptions and traps the financial industry invents to shear the sheep. A cash rich position, conservative investing in companies with working business models and unemotional flexibility is the best way to deal with the coming fork in the road that can either lead to Japan style deflationary stagnation or an inflationary spiral.
At the end of the day *eveyone* is just guessing and those who guess right are suddenly geniuses. It has always been that way.