Above everything, remember there's a movie planned for August 2004. Meaning that at least by August we will still have the anime around. And I'm sure there'll be one more movie at least.
'Sides, as people have said already, the manga is unfinished and showing no signs of slowing down. Seriously, there are some aspects like <span style='color:#D6DBE0'>Kakashi's life and Yondaime and Orochimaru's real real intentions</span> for instance in which us manga readers know as much as you anime watchers do. Which is to say, not really a lot.
So nope, Naruto is definitely not stopping any time soon.