I'm not suggesting that the show isn't fictional--I just like fictional shows that are still grounded in reality. A show can be fun, exciting, and action packed without being outlandish. It's not that he survives life and death situations--I'm fine with that as long as the storylines are good--but for me, there comes a point when your hero becomes a caricature of himself. Again, I love Bauer, but surviving planes crashes and viruses and and nuclear bombs and now potentially a seemingly deadly chemical weapon? Really?
And James Bond and Jack Bauer are different. Bond is a character that is meant to live on for decades, via different actors and different approaches to each series. Jack Bauer exists in only this iteration of "24"--when the series ends, his character will not continue on. He is not necessarily meant to be an immortal character.
Again, I think there's a difference between being fictional and being outlandish. Everything we watch on TV--if it's scripted, is fictional. But, take "The Shield" for example. I found that series to be highly gripping and intense, and yet it always felt grounded in a believable reality. I'm not saying I want "24" to emulate "The Shield"--they are two different animals. But I think all the danger your hero consistently puts himself in, season after season, has to count for something. If "24" was a series about a stay at home dad, I wouldn't feel this way. A series about a counter terrorism and a man fighting to save the country? I feel at some point, his luck should run out.
I think it brings integrity to the show because, except for a few very minor characters, no one survives on this program. No Bill Buchanan, not Nina Meyers, not Presidents. The end comes for everyone, yet the clock keeps ticking and a new day keeps dawning. I think the best way to end the series is for Jack to give the ultimate sacrifice for his country--his life. Again, I liken it to the deaths of Teri Bauer and David Palmer--you didn't really think it would happen, but you genuinely appreciate the fact that the show would have the balls to kill off a vital character for the sake of the story and series.