The only coach whose dismissal should even be CONSIDERED is Crossman. Other than that, Hackett hasn't even had a full year, and he is leading a rookie QB to boot. Pettine is doing well.
Positional coaches, I'm not sure about. Henderson has breathed new life into Leodis, Weaver has his D line on pace to break a franchise record in sacks. The rest havent really had glaring issues other than WR, and that is a very green group plus Stevie.