I had a feeling that Sakura's "Sasuke-kun" was going to be thoroughly discussed the minute I read that panel. You guys are so predictable. 
I supposed I understand where you're coming from. The reason some get upset is a combination of Kishi milking the romance for all of it's worth, and getting influenced by the opposite fandoms into believing that what they say has more value than what you think.
Just try to sit back and enjoy the chapter for what it is. The reason Sakura said the "Sasuke-kun" was to trigger Naruto's jealousy which does two things:
- I reconfirms for the second chapter in a row that he still likes Sakura since he also wants her attention
- I makes you remember the good old Team 7 dynamic
I think it's understandable that Sakura is happy. You have to remember that whether it ends in love or not Sakura holds Sasuke in the same esteem as Naruto does. Sasuke is also Team 7 and she's glad that he can be there after all this time.
I'd be pretty funny if eventually we get the forehead complement and then we remember how we all looked silly complaining about this chapter. And I think, as others, that the forehead complement is coming since we already have established the NaruSaku/MinaKushi parallel, as well as Minato basically giving his blessing to the soon-to-be couple. That can never be taken away from us no matter what.
It would feel silly at this point that Kishi just made that parallel as a way to be funny. It was meant to reflect how things are meant to be. And now that Sasuke is seemingly on their side there's nothing preventing Naruto from confessing to Sakura and going all out to win her affection. In all honesty even back in Part 1 I think it was going smoothly, and it reached a high point when Sakura found out that Naruto was the one who rescued her from Gaara. But the Sasuke left and it left everything in a standstill.
So I'm interested to see how it shall be resumed. The reason Sakura's confession failed is because even if she wants to be with Naruto she still can't deny what she feels for Sasuke, and now that he's there that can be worked out somehow.
The most essential thing to have in mind is that Naruto still like Sakura very much, and considering his personality he's gonna keep loving her for the rest of his life no matter what happens. So it's either Naruto with Sakura or alone, anything else he chooses is a consolation prize. And considering the build up their relationship has had I really don't think there's any possible scenario in which Naruto doesn't end with Sakura.
Many thing that Minato making the Sakura/Kushina reference sounded like the stuff of fanfiction since NS would become to obvious if it happened, but I guess what Kishi did it anyway. Kishi might want to keep Sakura confused but he want his readers to understand that she's meant to be with Naruto, just like Sasuke is meant to be their trusted teammate again. I mean, we all knew that Sasuke would eventually return to the good side even if Kishi made it seem sometimes like it was a lost cause, so it's the same with Sakura, we are supposed to know that she'll end up with Naruto even if Kishi makes it seems like she still doesn't. If this wasn't Kishi's intent then the parallel towards Kushina would be unnecessary.
What I'm curious about is Juugo's "Sasuke, what are you thinking?", that's a clear indicator that there's more to Sasuke than he's letting on. There are still more surprises to come, there's more to his claim of wanting to be Hokage, all of his intentions are yet to be revealed. And there's the fact that Karin, Suigetsu, and Oro are missing. We'll see.
Anyway, what I recommend is to not read any of the opposing fandoms opinions. It's a little sad that it's come to the point that characters being happy around each other is now twisted to be some sort of declaration of love. But then again, I won't blame them if they do so. They got a huge reality check in the previous chapter regarding Kishi's intentions with NS, so they'll not only deny what happened with all the fiber of their been but will also take the opportunity to use any minimal interaction as proof to their favor.
And in the end, as some pointed out, she immediately focuses her attention on Naruto when he reminds her he's also there. Sakura isn't going to neglect one boy for the other, just like Naruto won't neglect Sasuke in favor of Sakura.