So tell me what is the normal life expectancy of a tv series ( be it comedy or drama or whatever)? Do most shows run their course in 4 seasons? Are there series out there that have really stood the test of time through all seasons? Alias started going south around the second half of S3. Smallville from what I hear is losing it's magic in it's recent season (4). I do here that 24 is killer and has been for all seasons so far. So what are your opinions on this topic?