The problem could be...is it really different enough from a lot of other news magazines out there on the networks or on cable these days?
60 Minutes on CBS still scores because it's the original, and in many respects still the best of the breed of newsmagazines. ABC's 20-20 also has a track record and traction with the audience. NBC was late to the game and has always struggled to get things right (TV historian Tim Brooks counted something like 14 different failed newsmagazines on NBC during the 70s, 80s and 90s before Dateline finally got a foothold with audiences). Some networks just struggle with certain genres decade after decade--CBS hasn't had a successful early morning show since Jack Paar in 1954, and they decided then that early morning viewing wasn't going to make money and moved him to middays--they've never been able to reclaim that daypart since. It's been flop after flop. NBC's big problems are primetime news magazines and scripted dramas, they've haven't done as well as the competition for almost a decade. ABC does OK at everything without dominating much of anything...and Fox does OK with shows like American Idol and the Sunday animated sitcoms which are quirky and young-skewing, but are short on other kinds of shows that can endure.