TV executives must have been happy to put a fork in the 2012-13 season. Ratings dropped across the board for broadcast networks due to fading reality franchises and the failure to launch any major new scripted hits. Cable also slumped, with audience levels flat compared with the previous season. And with the number of viewers who time-shift growing, the path to success is more treacherous than ever. Here are the shows that navigated the bumps — and the ones that became ratings road kill.