"He's untouchable, in complete control of the club and runs the club like a dictator. No one has the authority to fire him. He will go on and keep on overseeing a lack of success."
Robson believes the Frenchman has split Arsenal's fanbase.
He said: "Who is celebrating when they come fourth? Football is about winning things.
"Fans want to experience triumphs. Wenger on the other hand gives them a kind of relegation battle in reverse."