Nobody should be surprised that the Justice Department has opened an investigation into the NFL’s antitrust exemption — but it’s far from clear how this game will end. For the record, I’m not a big fan of the NFL’s business model. Among the aspects I find loathsome (its embrace of gambling is at the top of the list) is its nifty little exemption from antitrust laws that allows it to collectively bargain on behalf of its teams with broadcasters vying to air the nation’s most popular sport. The