For all we know, in #450 Hinata was thinking, "Oh, look! Sakura is hugging Naruto but he's not hugging her back. I have a shot at him!!1!"

And really, that's the thing. There isn't much to know about Hinata, nor has there been much opportunity to learn about her -- as Inferno180 has been saying. She's not had a lot of focus outside of her feelings for and pursuit of Naruto, so I question the idea that she would give up her single defining characteristic because of that hug.
Just my opinion.
Well KnS thats just it, if a character has more screentime, we have more to work with. Same reason its not easy to relate to Kankuro or Shino, they have talent, they are decent characters, but they have hardly any screentime. Team 7, all of them have wide open and expanded backgrounds we can get behind, even for the limited times we have seen Sakura's parents in fillers and RtN, we know a great deal about her daily life lore wise (and Kizashi and Mebeki are canon characters, not only cause they were designed by kishi but they always existed in the background), she has her back and forths with them being a teenager but she is also growing up trying to find her own future, as most parents would, they take issues with some stuff and only wants what is best for their kids.
We can relate with Shikamaru, Tsunade, and Gaara, 3 major characters (gaara is not even seen as much as Hinata yet he has more importance!) all had development and varied backgrounds that changed. Hinata's was more or less the same until just 615, did much change in the duration between Naruto and Hinata between pain and 615? No it did not. NH is not that complex, its still, for all means, simple without much advancement. NaruSaku has varied and gone through a whole deal of ups and downs in the relationship between Naruto and Sakura yet its NS that aside from development shows the basis of a real relationship, they go through highs and lows, they have literally caused harm to each other yet still have an unbreakable friendship. If Sakura never thought differently of Naruto from the 4 tails, I'm sure Naruto would still forgive Sakura from her actions in the land of iron and still love her. Sakura had every right to be scared or even fear Naruto, but after seeing everything he did for her and learning about the 9 tails, she always saw him as Naruto, her friend, not the 9 tails. Sakura knew Naruto and Kurama were separate, Naruto was not a monster, he was an idiot but he had a good heart. In the long run of things, Hinata is well overly simplified as is NH. If more had come from Hinata, namely more development when there was abundant opportunities to give Hinata development before pain, but she was never used. In shippuden, she literally gets steamrolled then vanishes to the back until 615. The war arc, every character had to come in and out for time, she had only more encouragement from Naruto, Sakura again at least got a major moment with the white zetsu, it at least advanced the story actually giving Naruto a reason to be on the battlefront aside from stopping Obito.
It is right that Hinata's traits having a naruto anchor could be hard to imagine her without, but think of it like this: her development being happy for Naruto in a NS ending and standing independent could be a realistic one. She has not been used a lot, she does not need as much closure. She has gotten closure with Neji cause he died, Naruto is her only reason to still be in the story, yet on her own, she has to fulfill her own development. Unlike her, all of team 7 is impacting each other (save Sakura having no impact on Sasuke), team 7 has a complex web of interaction and development which needs to resolve, it could take all day just describing this for team 7, but for Hinata, it remains very simple. Hinata becoming unbound from Naruto, just being friends or gaining her confidence on her own, its completely feisable. I mean her being seen by naruto as an equal is enough aside from becoming hyuga clan leader. In the same way Sakura needs to get over Sasuke, Hinata's end development can simply be standing on her own, without a crutch. She is not the jealous type, I mean she was happy for Naruto when Sakura was hugging him (despite not knowing the love Naruto has for Sakura). Only Naruto and Sakura know the love triangle, yet Naruto is unaware that Sakura knows he loves her, he technically never confessed, him confessing to Sakura or her confronting him about it could be the push for Sakura to turn to Naruto. Hinata's resolve with Naruto can be best as an idol, encouragement relation. In a scene after the Naruto vs Sasuke fight, if Sakura was hugging Naruto and Naruto did it back, and Hinata saw it, she could even just see it, silently in the back, smile, and move on.
My point is, because of screentime and development, Sakura needs more time like Naruto and Sasuke to resolve all interactive development and come to her final development. Hinata is very small, her only remaining character association is Naruto with Neji gone. Hinata, a real easy ending can be put forward, just if one easy ending was NH, it would just be weaker by all other means with hardly any change or advancement on her character. If she stands as a leader and becomes clan head, thats the main thing she needs and that can happen, but as for love, its just due to her lack of screentime and only minimal advancement, NH would still be weak by all means. NS has had development, several events, and back and forth mutual growth between Naruto and Sakura, it has been minimal in NH. When it comes to Hinata and Naruto, Hinata can simply stand on her own full of confidence and able to be a leader, she can easily become unbound or be happy for Naruto if she sees he loves Sakura. Its still at this point, no matter what comes forward, if NH is canon, it cannot make up for the lack over all these years, it would ultimately be rushed, weak, and rather lazy, forcing Naruto to contradict himself by giving up on Sakura, and cause some damage to the story logic.
NS is still the only one that fits and its hard to imagine it not coming forward.