Could everyone stop taking the piss ? Murray has to believe he can reach the summit otherwise playing on is pointless. It's not a matter of this being realistic or not. It's the motivation factor...also just how realistic is Murray's goal ?
1. Federer is not that far ahead and is retiring soon.
2. Nole is still the undisputed number one but signs are there that the 2011 imperious form is over.
3. Nadal is prone to injury and should he miss a GS Murray will take full advantage. Don't see any inexplicable losses a la 2009 Wimbledon.
So as you can see Murray's optimism is not way over the top. It's doable people.
Now having said all of that I am not happy with Murray this year. He has to step it up and go on the attack from the get go