The one comment I pick up on, was McEnroe's interview stating that Andy MUST control his oncourt emotions.
This is far more important than requiring a sports psychologist. Andy gives too much away to his opponents, who take advantage of Andy's self oncourt-flagellation. Once he can do that the rest will probably be history.
I know Andy has made enormous strides in this direction during the past year, but there is more improvement needed.
But surely he needs someone to help him control those emotions? I totally agree, he gives far too much away, and he needs to reign that in. It doesn't look like he is capable of doing that by himself, and it doesn't seem he is open to any psychological help. This, I feel, is his downfall.
Having said all that, I do think this is why his fans engage with him. He is human, and always shows the vulnerable side of himself. He is true to himself at all times, and that counts for a lot as a person, maybe not so much for a ruthless Champion though.