Make-or-break season for Rivers?

There was a time not too long ago that Philip Rivers was described using that most frustrating of terms -- "elite" -- and that the San Diego Chargers' trade that sent Eli Manning to the Giants in exchange for Rivers wasn't seen as that bad of a move, despite the greater team success enjoyed by Big Blue. Unfortunately, over the past two seasons, Rivers has declined precipitously, and there's now some thought that perhaps 2013 may be his last in a Chargers uniform if the trend isn't reversed.