It’s a shame, Wayne finally came into his own near the end of the season he should have been kept on or atleast been replaced with Veep Daniels, or Sec Def Heller.
I think a plot line may involve Secretary of Defense Heller’s daughter (and Jack’s girlfriend) Audrey. After getting rescued from that Chinese prison she was basically a non-responsive shell and was in that condition at the end of last season. Maybe she was brainwashed, a la ‘The Manchurian Candidate,’ and has been programmed to wreak havok on the US government or the military. Maybe she’ll end up being an assassin, spy, or whatever..... a villain who Jack will be forced to kill in a climactic, tension-filled, emotion-packed finale.