That's just the tip of the iceberg: I just recently reread the Chuunin Exam arc, and the NaruHina is all over the place. During the whole Hinata vs Neji fight, you can really see how similar they are in the sense that they're both considered failures but trying the best to improve. When Neji abuses her verbally during the fight, Naruto clearly shows that he understands her better than everyone (maybe save only Kurenai). Hell, after the fight he even swears on Hinata's blood that he will beat Neji.
And then you have Chapter 98, and it really can't get more explicit than that. The bond that Naruto has with Hinata is much deeper, the only ones that may have more in common with him are probably Sasuke and Gaara.
I don't hate Sakura and I recognize her merits, she's clearly a strong ninja who cares for Naruto, but... there just isn't much to build a good, well written romance between them.
Naruto and Sakura have a good friendship, I just think there are more hints for NH.
The only point I'm willing to concede is that Kishi's skill in writing romances is... not always constant to say the least, like Naruto completely forgetting about Hinata's confession after the fight with Nagato, which might still fuel hopes for a NS ending. But I blame that more on Kishi's bad writing than on Naruto's genuine disinterest. (Plus come on, what disinterest? Hinata being stabbed was enough to piss off Nardo enough to turn him into 6-tails mode.)
