Well Naruto's personality has already changed a great deal in the manga and anime. He is a lot more mature and grave for the most part. He acts a lot smarter even though he's still an idiot and borderline legally retarded (SASUKE, SASUKE, SASUKE!)
And I think Takeuchi has handled the changes well so far. But I mean, if we start seeing Naruto at a more advanced age, I don't think it will make as much sense for Takeuchi to keep playing him.
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