Now, almost 8 years later, some of the world's top hedge funds are in agreement, and they are worried.

As the WSJ reports, these prominent hedge fund managers join an increasingly bigger and louder chorus which says central bank bond buying programs that are pumping trillions of dollars into global markets will end badly.

In yesterday's main event, the ECB said it would extend its asset purchase program to the end of next year, buying bonds at a reduced rate. As the following chart from BBG projects, at the ECB's revised rate of bond purchases, its balance sheet will soon surpass that of the Fed.