I can see Naruto dying in some epic battle while he's still pretty young, but not before the end of the manga. I just don't think it's the kind of manga that lends itself to killing off the main character. I mean, Kishimoto has done a fairly good job of killing off characters from the 'good team', (or at least, a better job than Kubo Tite does with Bleach, haha), but I still can't imagine him ever having Naruto die.