Focus on the "gets friends with Naruto" part.
Well, First shots we get in Naruto is the story behind the Kyuubi attack on the village and the mighty 4th hokage defending the village from Kyuubi. I understand that the "real" story behind all this is more complicated, but Naruto befriending Kyuubi would indeed ruin the series for me, because all this time I was led to believe it's 1 thing most evil in this whole Naruto world only to find it get a change of heart.
Don't get me wrong, seeing Kyuubi and Naruto cooperating would be nice, but after Itachi's reveal Kyuubi going "good" would be too much.
You state that like a fact while it's your own assumption. Elaborate if you care enough, but Naruto goes "berserk" for a reason, don't you think?
that'd work