You'd have to go through and take out portions of episodes, and then reedit them together to get full length episodes, and that just seems wrong to me. Also, the filler material isn't terrible and fits in nicely with the original material. Except for the recap episode(s). There was one during the bridge storyline that took half an episode, and then the "newspaper report" recap. That was annoying.

Anime adaptations of manga aren't meant to be complete photocopies of the manga. Naruto seems to stick pretty close to the manga without too much filler. Of course, I've only read the first 3 volumes of the manga, so I can't speak for how it's been recently. But since they haven't caught up with the manga yet, I'd imagine that it's been consistant. More or less. I've seen adaptations that have been so different from the manga that it's almost a whole different beast all together. And compaired to the American adaptations of American comics, manga to anime adaptations like Naruto are pretty damn faithful.