Sakura was never shown even liking the idea of nH, hell she even told Hinata what she did was stupid. This movie is a complete asspull, because they literally rewrote the whole story, just to make one pairing work.
Sakura supporting nH, is like saying that dumbass scarf was relevant in the manga. It's kitten.
nH shippers can try and mock us all they want, but they can't look back at the manga and find many moments showing nH would be canon. Heck, they can't find panel proof that Naruto was actually in love with Hinata, they need to look up images of a kitten movie, that everyone hates, just to finally find a scene where Naruto actually showed any kind of feeling for Hinata, outside of encouragement.
Meanwhile, we can pull up panel after panel showing Naruto liking Sakura, cheering her on, and stating how great she is.
nH can have the worst Naruto movie of all time, for their only place to find mutual nH moments. Meanwhile NS will always have solid proof of it's existence in the manga, movies, OVAs, even from the author himself. Kishi can't take back his words, nor can he delete his entire manga, so in the end NS was, is, and always will be the true end pair, because the manga officially stopped at 698. Everything after that was SP taking control.