Another reason could be that it would have been a helluva lot more creepy if Naruto would have gotten to be intimate with Sakura while pretending to be someone else.

If Naruto had ever once given us an indication that he was interested in Hinata romantically, and we had been shown that he had a conscious desire to hold her hand, then it would be similar. But that's not the case. Hinata wanting to hold Naruto's hand is not equal to Naruto wanting to kiss Sakura's forehead because one was Naruto's personal desire and the other was not.
And it's a difficult battle proving that Naruto was thinking of Hinata's romantic desires at that moment in #615, or that he was encouraging her interest in him in any way. I don't believe for a second that he was consciously paying her a romantic compliment (like his desire to kiss Sakura's forehead was), or that he was expressing a desire for her or for her to feel desirable (like his desire to kiss Sakura's forehead was.) The circumstances are completely different, and in my opinion, at least, Kishimoto's intention with the scenes really can't be compared due to context.
As I have said before, the problem I see with SS and NH is that they exclude Naruto's feelings. SS exludes Naruto entirely, and until it's proven that Naruto no longer loves Sakura, that NS has no chance of happening, Naruto is shown to move on, and moves on to Hinata specifically, then NH also excludes Naruto's feelings.
In the absence of Naruto's explicit romantic interest in Hinata, in my opinion the interpretation you suggest above -- "the moment that showed that Naruto understands Hinata without words and that by fulfilling her unspoken wish makes NH very close to canon" -- is from a strictly Hinata-centric perspective, and ignores Naruto's currently established feelings in the equation.
Just my opinion.
I see your points. I mostly meant that Kishi as the writer would have been thinking the connection to Hinata's desire to hold Naruto's hand. That Kishi intentionally made Naruto take Hinata's hand to show the readers that NH have a connection and will be canon. Just like he could have written Naruto to walk to Sakura and kiss her forehead to remind the readers that this is something Sakura hoped Sasuke to do to her and imply that maybe Naruto is the man for her. In the similar way Kishi might now show us that Naruto is a good fit for Hinata by making him act the way she wished without even realizing it.
Edit. It at least seems pretty obvious to me that Kishi made NH hold hands to fulfill Hinata's development and her desire since she specifically mentioned wanting to hold hands with him. How Kishi will follow this "fullfillment of Hinata" is a different question. Now that she has gotten what she wanted, will Naruto let go of her hand and thank her for being such a good friend and therefore imply that NH is just platonic for him? Hinata has gotten what she wanted, she could then let go of Naruto. This is certainly possible.
Edited by Poison_In_Your_Coffee, 06 January 2013 - 07:39 PM.