About the narrative feint mentioned earlier, isn't this a little late for such a thing? I might give that theory more weight if this manga was somewhere around the middle of its lifetime. But it's nearing the end and Kishi has never really devoted a lot of time to the romance department. So the theory goes that now, after all this time and so near the end, Kishi is suddenly going to take a detour to NH, make it seem like it happens but actually demolish it, then destroy SS maybe in similar fashion and then make canon NS, the real, always intended pairing? I don't know, that sounds quite weird to me.
Why do you think it's weird for NS to happen if Kishi seems to be forcing NH and SS now almost at the end of the manga? I think its one of his skills as a mangaka for him to mislead his fans making them think it's going to be said pairing after they did something like physical contact (than hand holding for example) and them he makes something else different that is in favor of the pairing he has been developing since he started writing this manga. I do not disregard the 400+ chapters of NS development, the hints, the parallels etc he can make a panel showing like it has NH or SS indications but the development done between Naruto and Sakura is still there and it will remain there. Another of Kishi's skills is the art of trolling the fans especially with the shipping fans, how many times has he done this??? A lot. There's also the skill of giving fan service to those shipping fans just for the sake of keeping the pairing wars active and continue keeping the drama and the tension in the manga. The force NH and force SS he might be planning in the future can also be the move of" throwing a bone" to those fans, the fact that the manga might end this year could mean Kishi has thrown the final bone to NH fans and he's planning to throw the final one to SS fans as well before ending it with his pairing of choice.
For NH and SS to happen there must be "a lot" of development between both parties that will last "hundreds" of chapters to do. And I seriously doubt the manga is going to continue for another 400 chapters (like Oda with One Piece saying his manga might last until chapter 1000 or more lol). If Kishi hasn't started doing this development only to do it one sided then I believe he's not going to start now. He only needs these two pairings to create tension and drama in the story and also for opposite fan service to keep those shipping fans to continue reading his manga.
To sum it up.
For NH to be canon:
-Naruto must move on from his feelings for Sakura (this will never happen because he will never give up, that also includes his love for Sakura. And also because Kishi has shown it since chapter 3 and the fact that he STILL hasn't shown any indications that he has stopped loving Sakura and is now in love with Hinata and I see Naruto falling for her OC. This is why NH is a fan fiction pairing).
-He must fall in love with Hinata (if a confession, pep talk and hand holding didn't changed Naruto's mind to stop loving Sakura and fall for Hinata, then nothing will change his mind and he will forever remain loving Sakura. Also because of the above^).
For SS to happen:
-Sasuke must be redeemed (this is the end of the manga after the final battle between Naruto and Sasuke).
-Sasuke must fall in love with Sakura (since he has NEVER shown any romantic feelings for her, I doubt getting redeem will magically make him fall in love with her just like that and everything will be all right. It will be like nothing happened between them. No knocking her on a bench and trying to kill her several times).
Sakura must love Sasuke- (she only has some remnants of her feelings for him. And those remnants are base nothing on a silly child crush because she's aware now that the Sasuke she once knew was nothing but a fantasy. Even if she does embrace her feelings for him and willing to let him into her life, her strong feelings for Naruto will prevent her from making a big mistake).