Well you are taking a fictional work too much to the heart. It has been going in this direction for sometime now, you know.Not to forget that Naruto knows exactly what it feels like to be not noticed after all the attention so he would appreciate someone liking him just for himself. He liked Hinata ( he said he did even though he felt she was weird) and it's flattering that someone likes you enough to die for you. Hinata's confession in pain arc, Naruto acknowledging her and encouraging her during the war ( while fighting with Zetsus) showed his appreciation and Neji's death kind of sealed it. He died protecting Hinata who was protecting Naruto. That gave them something in common to relate to and feel for. No wonder their son is named Boruto/Bolt honouring Naji's memory.NS fans everywhere like me are really butt hurt at this ending. But at this point i really don't care anymore for ranting and arguing. If naruto ends up with a girl, with whom he hasn't had an actual conversation with in 700 chapters then fine. If sakura wants sasuke so bad that she is willing to leave the village, her family, and friends to go on a journey with him with no particular destination after the same guy essentially stabbed her twice and almost killed her once then fine. But do you think in the movie, naruto and sakura will have some type of conversation about what exists between them as a means of closure? Sakura has been made aware of his feelings by sai, and we all know that at some point naruto did love Sakura. So both are aware of the situation. I will be so pissed if this isn't addressed. Also, is anyone else surprised that Sakura never found out that it was Naruto in henge on the bench with the cute charming forehead thing?
As for Naruto /Sakura - That pairing could have been pretty interesting too and I agree that there were many elements which might have worked in their favour in different circumstances but that was something which depended on how characters felt. Sakura definitely likes Naruto but as a team mate, and friend. It could become a relationship if Hinata and Sasuke were not in the picture and they could found it on the basis of mutual respect, understanding and empathy born after years of knowing each other and a more mature kind of love. But the way story went, it always worked more on Sasuke/Sakura pairing than Naruto/HInata.
As for closure- I think Naruto already got a closer when Sakura requested him to bring back Sasuke for her.
At that point he knew whether she starts liking him or not Sasuke was likely to be between them. And when she tried to tell him that she loved him but failed to make in convincing enough for him to believe it. And the fact that she couldn't bring herself to kill Sasuke and faltered. The fact that when someone else made advances towards her during the war even then she thought of was Sasuke, only.
Everything she learned about Naruto was at much slower rate. She realized his sincerity and came to understand him and appreciate him but it was more like pretty close friends than lover's love. So there is no need to feel sorry for them. In fact Naruto succeeded in so many ways that a small disappointment on that front would do him good.
As for her going with Sasuke I guess she always felt for him and he showed he appreciated it and apologized and has been trying to redeem himself rest of his life so what's wrong with him getting someone dependable..... Especially if he hasn't chosen the artificial hand either, I'm going to think of it as his self punishment of a sort for what he trouble he caused to Naruto..( we will see in the movie only but.. whatever)