I know its easy to look at a store and just go well this CEO must be stupid, but there are many factors that go into the situation. I am sure that Dixon is set up in such a way that it would be difficult to copy Apple's retail strategy.
He could have improved the stores and retrained staff under new morals to improve customer satisfaction but he never did any of that. He wanted his sales staff to push insurance policies and other crap to the point where customers would either cave in or walk away and to go John Lewis.
Yes, time will tell if his appointment was worthy, but judging by the state of his retail channel and the British public opinion of their stores, I am still puzzled by his appointment.