It is plausible that Jack Bauer dies, and Tony Almeda carries the show.
Plausible, but not likely.
Jack Bauer is irreplaceable. He's the epitome of the good-government-agent myth.
Hell, I'll say it. Bauer is awesome.
Someone will get Jack's (hot) daughter in, and her stem-cells will make Michael J. Fox proud by doing the job and jumping the shark--er, saving Jack Bauer...