The players are not just the only ones at fault, it's the manager, the whole club and supporters. Roman Abramovich and the board has hired and fired 8 managers in 12 years leaving not much stability at the club, the manager has bought, dropped and sold the likes of Mata, De Bruyne & Lukaku, the players never like certain managers and the fans wanted Grant, Scolari, AVB and Benitez out of the club so this proves everyone is at fault.
Roman has put in over £200 million into Chelsea, he hired Mourhino and fired him in 2006/07, I don't recall the fans complaining or showing their disapproval too much at the owner at the time.
He did the same thing to Ancelotti and fans favorite Di Matteo and again there wasn't too many complaints by the fans.
I as an Arsenal supporter want Wenger out, now if I get my wish and we end up like Man U or Liverpool of late then whose fault is it - the fans, the new manager, the players, the board and/or the majority shareholder (Stan Kronke)?