The stock market could sink 10 to 15 percent as soon as the Fed tapers its massive bond buying, but the "fat, dumb and happy" central bank won't do that just yet, hedge fund strategist Michael Novogratz tells CNBC.

So the market could go up a lot between now and then, said Novogratz, a principal at Fortress Investment Group, the publicly traded hedge fund with $55 billion under management.