The credit ratings agency Fitch predicted Thursday that at least one broadcast network -- NBC and ABC would be "the most likely candidates," it said -- will likely attempt to regain ground by becoming a cable network within the next two years. With the recent GE-Comcast deal involving NBC, it noted, "the odds of that happening just increased significantly." Cable networks have an advantage over broadcast networks because they are able to garner revenue not only from advertisers but also from subscription fees. Should one of the networks abandon the airwaves, Fitch observed, its affiliates would be "negatively affected." On the other hand, the remaining broadcast networks and their affiliates "would naturally benefit." Fitch concluded: "The lines between cable and broadcast are sure to converge at some point, given the former's continued audience and advertising growth and the attendant declines of the latter."