Oh, there's no question that Kishi is reciting a party line for the sake of the film and the future spin-off. My comment was only meant to indulge in the newly behind-the-scenes "insight" into his writing methods.
Off the record, the theory that I'm remaining by to explain this horrible twist is that he either succumbed or was forced into a pact with the executives/publishers/Pierrot for the sake of future licensing of the series with a concept that they believed would be more appealing to readers and viewers than what Kishi's original vision might have been.
Yep
My brother believe ( he don't even follow Naruto just seen a few episode, but I make him read the ending a give him information about the movie, he can believe how this story turn out OOC character, and all the Hinata promotion in the movie lol) that if the movie don't sell so well and people react negatively toward it and if their spinoff or part 3 series flop too, if Kishi got a little pride as an author, he might do the ending he did intent for Naruto.
I answer him that I don't believe that would be the case, though when you mess something up and people react in majority, who knows.
Movie mess up badly to make it a bad romance plot instead of a story about the character and kickass ninja action. (Naruto is still a shonen, not a bad shojo to justify a bad idea to begin with)