IMO, Sakura/Kakashi role diminished tremendously ever since Naruto came back to life, or even way back to Madara begin to gain control of being the bad guy. It is a fight that takes place to a different level, inhuman-type. In a way, they are 'useless', but the knowledge and experience (especially Kakashi) is one that can be of help in a way, which is why Kakashi stressed the need of a proper strategy to Sakura in previous chapter. And was shown, through his accumulated experienced he was able to save himself by using scrolls. But not Sakura. This is the difference between them; war experience and level of assessment.
Naruto quote can be hurt if taken solely on that context. But from my understanding in next page and from previous statement by him in chapter 678, it is a yes and no. Yes, they are useless in giving hand for actual combat at the moment. But no, they are not completely useless. As I said, both of them are known to be good in strategy making, apart from shikamaru. That is why Sakura agreeing to Sasuke's statement, but relieve the moment Naruto clarify his unshaken standing point in the matter, by thanking him. And I don't think Naruto statement can cause mistrusts in her.
But you are right, we have been spoon-feed with too much melodramatic on shipping stuff. I think everybody was dying for a tremendous development from Sakura, but as I said in my previous posts, restricted panel pages, slow development in the arc beginning makes people to have a divided response. Which is why this is called entertainment & audience.
I agree that Naruto thinks Kakashi and Sakura are useful in making strategies. However, this chapter, Sasuke has explained his thoughts to Naruto, that when it comes down to it, he will sacrifice Kakashi and Sakura because they cannot do anything in this situation. This also includes about their strategy making abilities. And while, Naruto doesn't agree with sacrificing them, he does agree that Kakashi and Sakura can't do anything.
Naruto's statements didn't cause mistrust since it was true. But it did hurt her a lot. He was always saying how great she was. That same guy, agreed that she wasn't. I don't blame Naruto, but at the same time I can understand how his statement can hurt Sakura a lot.
Edited by ramenanmitsu, 11 June 2014 - 10:07 AM.