Just thought i would add my 2 cents to this thread:

AssertnFailure: Naruto will never kill Itachi. I'mnot saying that he won't have the power when the time comes, but he just does not have it in him to kill another human being.

Insomniac: While the Kyubi may be the most powerful being in Naruto, I don't think that he is undefeatable. There is Gaara's demon, Gamma Bunta, and lot's of strong Ninja's in the Leaf village for the Kyubi to contend with.