Looking at all the roles left with NAs, they're all basically useless at this point. Robb can roleblock 1 house for a night. Jaime already used his revenge kill for Joffery. Cersei can't be killed once. Davos (possibly) can recruit someone to Baratheon. Melisandre can sacrifice Shireen (lol) to protect Stannis (double lol). If jorah didn't betray Dany, Barristan can protect Dany (triple lol) or if Jorah did betray, Barristan can reveal who Jorah is (quadruple lol).
So ya, Cersei having 2 lives will be a little difficult, but are you forgetting that she and Jaime die together?? Cersei's power/role is really the only relevant one. Davos might be able to recruit still, Idk if his interaction with the Wights wasn't a failed recruitment. Robb could maybe prevent the recruitment (but that's a shot in the dark on which night to use it) otherwise there's no other role that could/needs to be prevented at night..
Edit: and like I said previously, there's like 2-4 people per house now anyways, no house really has an edge..