Karin is certainly another possibility for Sasuke. Thought, she did sort of indicate that his good looks are no longer enough to keep her interested since the incident with piercing lightning and all that. One thing that keeps me hopeful when it comes to SS is that Karin did get over Sasuke (or did she?) when he tried to kill her. Why didn't Sakura? Is Kishi trying to show that Sakura's feelings for Sasuke are truly unconditional? Or is he trying to show that Karin is the one for Sasuke since she doesn't take that kind of kitten from him (or does she)? If I were Karin, I wouldn't piss off the man who tried to kill me by slapping him. Sasuke does seem more stable now, so maybe he wouldn't try to kill her for doing that.
Edit. To be more on-topic. I don't think Hinata is going to die in the course of this manga. She has already survived one attack when Pain tried to kill her. And now Neji sacrificed his life to save her (and Naruto). There is no way she will die now that another character has done such a thing for her. Or I will be very, very suprised if she does.
And as you said you expect Kakashi to die which is an opinion shared by a good portion of the fanbase from what I've seen and he's already died once.
Honestly, after Neji's death I would not say Hinata's 'safe'. Just like with Gaara's situation now. He's had a 'death' but he's still not 'safe'... As much as I want him to be.
I don't think anyone's safe anymore. I really don't.