I think Naruto is going to change his Childish ways since he received word from the J mans death. I honestly dont think Naruto is stupid, I think he have a unique way of defeating his opponent, He is exactly like Gaara in all most all aspects, the only thing that differentiate him is the fact that he can control his emotions. Gaara became a Kaze kage, i think Naruto will follow the same path, The following Hokage will be Naruto, if he becomes more mature from facing Jiraya's death and learning with the toads.