Okay, this is purely my opinion and あなた can totally ignore this, but if you're interested, listen up!
アニメ have been known to be different from their original manga. Some changes are not major, some change the direction of the story completely. Usually, such changes arise at the ending of the anime. Think about most anime:Soul Eater, FullMetal Alchemist, KWMA, and a host of others, their endings are usually different from the manga. And when あなた compare these endings to the manga, the マンガ endings are (usually) much better.
Due to the never-ending suspense NARUTO -ナルト- is giving us, many NARUTO -ナルト- ファン have gone ahead and read what happens at the end, and many are pleased with it. But if NARUTO -ナルト- (the anime) follow the path of other アニメ and alters the ending...well あなた can guess.
This alteration is not expected though, as while major changes are made to アニメ from the beginning, the NARUTO -ナルト- アニメ has only gone through MINOR changes. All we can do is クロス our fingers and wait in anticipation, hoping that the worst does not come to pass.
Again, JUST my opinion!

*You can find the differences between the NARUTO -ナルト- アニメ and マンガ at the link below:
naruto.wikia.com/wiki/Anime-Manga_Differences