Do they have short attention spans? Or are their long attention spans actually hurting shows by pushing them beyond the point where the premise says they should have stopped? Dexter's ratings are what's pushing that show beyond the number of seasons it should have had, to optimally explore the premise. If they're not careful, the producers will turn that show into a procedural, simply because they've run out of ideas. Entourage went on and on, long past the point where there was anything left to say about the characters. Kurt Sutter has said he's got a 7-year plan for Sons of Anarchy, which if he can pull off, bless him, but that show sure looks to me like the story needs to kick into high gear now (Jax's long awaited confrontation with Clay and Gemma) for a big wrap-up by the end of next season at the most. Tell that to The Simpsons. Or its sibling, Futurama. I love Futurama, but this past season, eeesh...they are really really out of ideas now. Here's another show that has gotten hit or miss because the premise has been thoroughly squeezed: It's Always Sunny in Philadelphia.