I don't really see any fanservice in the manga. It's us the fandom who jump every time Hinata shows up. But let's talk about this chapter didn't others also show up. Shikamaru, Ino, Kiba ( and he had only 1 line to say), Temari but they were just watching the show nothing else. Hinata was placed by Kishi to relay some info to Sakura, and we have to see if it will mean more for Hinata's character or not. On a side note I thought byakugan only saw the chakra lines so it is a bit impossible for a byakugan user to see facial expressions.
And I agree with NS4L3G if he decides to develop a character he does it properly not just for the sake of fan service.
I don't think it meant anything for Hinata. Funny because Sakura is the one who's ordering to give her more insight info. If anything, it's all on Sakura that will make a move, not Hinata. As many have brought up, what can she do? Sure, the chapter covered that everyone has a shot, but for this case, fighting won't do. She may sideline and use her defense and/or eyes to support. Sakura can do both.
Hinata is only info giver in here as Sakura is the one to receive info. When something big happens, she will step in. Remember the last time, Kyuubi happened so she reacted without going there since that would be dumb. Then when Kyuubi left, medic on the way. Put it this way, Hinata is now doing the Hyuuga fodder role.