Although it wouldn't surprise me to see Sherback traded for scraps much like Andrighetto, that hardly makes him a scapegoat. To be a scapegoat it means you were expected to play an important role but failed.
So the only options are really: Price, Weber, Petry, Pacioretty, Drouin, Gallagher, Domi, maybe Danault.
Implicit to the OPs question is that he's asking who management (And their supporters) will use as a scapegoat. So with that in mind Weber, Drouin, Domi, and Danault won't be used because criticizing them criticize management. So that really leaves Price, Petry, Gallagher, and Pacioretty. Petry is probably somewhat protected due to Weber's injury as you don't generally scapegoat injury replacements (And it would bring into question going trading the younger player for the older player).
Pacioretty, it's a given he'll be given terrible treatment until he's traded.
Price, is the easiest target
Gallagher might get some flack if he spends a lot of time on Drouin's wing and the line isn't productive, but probably not enough to become the scapegoat.