"CNN reported that the search for the data recorders has been called off. So what will be the next course of action to determine what happened?"
It's my impression that that's a MSM oversimplification. An article I read a couple of days ago in either the NYTimes or the WSJ said that the investigation board is pulling together a variety of information to determine where to now begin looking further, though yes, they have decided that the area already searched is finished, and that Airbus Industrie have pledged further cooperation with such a search.