I'm puzzled as to why some fans think Naruto "owes" Hinata an official response, or that Kishimoto will have failed if he doesn't meet reader expectations for a specific form of closure for Hinata.
I mean, it took Naruto 631 chapters to admit out loud that he wants Sakura to be his girlfriend. I have a really difficult time imagining him confronting Hinata about her feelings, his lack of feelings, or his feelings for Sakura. Something like that isn't Naruto's strong suit, and why would anyone want to see a shy girl like Hinata be put through it just to hear bad news?
"H-hey Hinata, thanks for caring about me and everything, but I love Sakura-chan, okay? Sorry. Don't faint-tebayo!"
From a pairing stand point, I can understand why. She opened her heart to him and exposed herself to the risk of rejection. They feel she should at least know if he's interested or not (and not simply by implication). If he cares about her feelings, at least he should acknowledge them with some kind of response.
However, I think that's only the case if you think a romantic relationship is the goal for her confession. The evidence suggests that it wasn't the intended result. The context of her confession suggests that she said that expecting her fight to end poorly. I think she said it thinking she would likely die and that there would not be a second chance to do so. That, and I think she said it, to say it; so that he would know.
It has been noticable, IMO, that everytime Hinata defines some kind of goal around Naruto, she never defines it as being in a relationship with him. It's always couched in the viel of self-improvement and motivation for HER to do something.
With Naruto, he does say things that make it clear a relationship is his end and while Sakura's is muddy right now, she did the same as to Sasuke in Part 1. Hinata never does this. It seems that it's all about using those feelings for personal advancement or motivation. I don't mean to say that she is being selfish. I only mean Kishimoto seems to be using them as her vehicle for character development for HER and HER alone.
If that's the case, then you are right. A response is not necessary because romance is not the point. I also think that if this is the case, you will never see Hinata pushing for one.
Oh, and Sai feels like a fourth wheel in all this. He might be doomed. He's lost his way as a character. I feel bad for him.