While the DVR has long been viewed as a frenemy of programmers, and probably more of an enemy than a friend at that, the black box and other digital developments, such as Hulu and VOD, are likely playing a key role in giving poorly performing shows a stay of execution. After all, it's that time of year when new shows, with a couple airings under their belts, are at risk of being canceled. Michael Malone has the story.