Just read the post of Narusaku4life3g he already made a post where he answers why there havent been any NS moments for so long and why the last moments only where NH and Ss moments and im pretty sure hes right.
Also naruto is just a normal manga/anime like Dragonball or digimon or something like that

and all this storys have a happy ending where the main character reaches what he wants.
Well well, I'm flattered.
If you ask me, the fact we saw Jiraiya's list of regrets tells me Naruto must prevent that from happening to himself. So if you remember the list, then to me, it's safe to say that those characters will live to the end. Kakashi is Naruto's sensei, so if he dies, yeah perhaps I would start worrying. Konohamaru isn't dead and pretty sure he won't die. Sakura won't die. Sasuke is a big challenge for Naruto, which is why I do believe he will triumph in the end. Question is how. We will soon find out.
About the open ending, to be honest, I don't think that will be the case for this manga. Why? Because I do believe Kishi wants to close everything before the ending. This is the guy that covers everything that has brought up in the manga. If a bad guy say, "Damn, you remind me of Pain," he will get that covered in a flashback. That's why the war arc seems so incredibly long. Anyway, I don't think open ending is possible for this manga. It's all about hard work, and everything he has written has them. Romance seems unlikely to be left as open ended. Why? Because there is a seed on Sakura waiting to grow into full bloom. That seed is Sakura's hidden feelings for Naruto. It applies to my last statement, the fact Kishi covers a lot before it ends. Besides, I highly doubt Kishi cares if the fans will kill him for choosing this pairing. He made it too clear in the movie and the parallels. Of course, the developments help a lot as it is the main source. Parallels are third party support. Again, I highly doubt he cares. If he did, he would have rewritten the story in the movie that favors more for all pairings (mainly NH, SS, NS). But no, he completely ignore NH and once again revisited chapter 3 for SS.
Open ending is the second option, but I do think the chance of that is 20% right now. Usually, open ending happens to cancelled manga, or if the story fits. Naruto doesn't have that kind of story to fit in. Again, if Kakashi dies, I will start worrying. But I still doubt that will happen.