A) He is 75 years old lets not hold a couple slips of the tongue against him.
B) When he does a game, it brings a bigger sense to the game.
C) The football plugs are probably mandated by ESPN, also when they went down that road the game was decided, and his job is to entertain the audience to keep them engaged. He does this as well as anyone.
Also keep in mind that the majority of his audience were SEC and Big 12 fans who overwhelmingly have a huge interest in the FB playoffs. They are probably the most relevant two leagues in that thing.
Not everyone is an ISU fan who lost interest in FB a month or two ago.