A Football managers job is results driven, you could be the nicest man on the planet, all the players, fans, board etc think you are wonderful but if you don't get the results you will be unemployed.
Yes there are mitigating factors, re injuries etc that hamper his team selection but he has shown no sign of learning from his mistakes, changing the way we play to suit the players we have available, and basically competing in games.
Yesterday was a shambles from the kick off, no shape to the team, no desire to compete and get forward, no leadership against a team who to be honest are brutal, hardly scoring goals, and who had not won in 9 previous games.
SK has shown he is not able to respond in a game, change the tactics, play players in their best positions, etc, we need a manager who can.