I agree with you the pieisready...the Hyuga Clan's steady decline in the overall story is kinda sad. I honestly find alot of the lesser characters in Naruto more interesting the the main ones but you have to look at it like this.
Kishi has been builting up for this climax..for pretty much 2 years. You can tell he knew for the most part where he wanted to take the story and who was going to be involved. Secondly when you have a story as big as Naruto, with so many detailed secondary characters, by design, they are bound to only moments. Neji had a few moments in the first half of Naruto, but in the second not so much. Hinata has seen a greater role, but thats because she's Naruto's "one sided" love interest.
In the end will probably see what became of Neji and the Hyuga probably because Naruto's whole entire class will be mentioned. I have a feeling( a hopeful one) Hinata and Naruto possibly end up together, If Naruto ends up with anyone at all so thats pretty big for the Hyuga.
Will we see them in any real action again? Most likely not, because Naruto is pulling to a close and its all about are two way antagonist showdown in Tobi/Madara and of course the dueteragonist in Sasuke, and they have little to do/ could do little with resolving any of that.....