I think Eto will be fine. She's very central to the story and hasn't had any reflection moments and barely any screen time. I think there's a chance she'll be captured and may corrupt Kaneki into breaking her out and turning against CCG. That way he can free Hinami and (probably Tsukiyama) in the process. I can see him being raised to special class, and soon after attacking CCG...and then becoming SSS rated lol.
I just don't know how Eto's regeneration works. We haven't really seen a ghoul regenerate a whole limb, let alone half of their body. Noro could reattach them, but I don't think he regenerated them wholly.
And if Eto is dead, I wouldn't worry. Just let Ishida do what he does best. If he kills her off, he definitely has a way to keep us entertained. There are already so many unsolved conflicts.