Midseason brings not only new TV shows, but new time slots for a few old shows. Sometimes, a move is a reward for performing better than expected, as with CBS moving Blue Bloods from Fridays to higher-profile Wednesdays starting next week. Other times, no matter how superb a show is, the move is a slap in the face, a future pink slip, a slow-acting death sentence. That's what NBC is doing this week to 30 Rock...