This, coupled with the interview posted on saiyanisland where he speaks with his editor, proves one thing: yes, NS was planned, and his editors more than likely changed his mind.
I mean, just listen to this quote...
Kishimoto: "When you get together with other manga artists you hear stuff like 'You shouldn't just accept everything your editor says, right?' And I'd be like 'That's true,' but the other artist would say, 'But you do everything he says!' It's true... [laughs]"
There's only one thing left I have to say now- Kishimoto, you are a terrible man for sending this message to your readers. For telling all of the innocent children around the world who look to your manga as an example and inspiration that this dynamic between Sasuke and Sakura, among all of the other awful things that happened in the ending of your story, is acceptable, and anything otherwise makes you a terrible person. Whatever happened to being able to change your destiny, to be free? Not only are you a hypocrite, but your main character turned out to be one as well. What a joke this whole thing turned out to be.