The announcers and production crew. There is a reason ratings are down. On any given night almost any team can win. Parity in the league has made sports in to a local game. If you are not cheering for your local team there just isn't a reason to watch.
Parity makes for boring football.
The same for hockey and baseball. Some of the poor rating can be laid on the demise of the Broncos and Falcons. They were scheduled to play Monday nights when they were champs but retirements and injuries made them the dogs of 1999 and MNF was stuck showing them. So ratings dipped. Howard Katz has hired Don Ohlmeyer to produce the new Monday Night Football show.