We will struggle to have someone who has his passion for the club on and off the pitch! That combined with his ability to lift players confidence on the pitch and bring players into the game like he does makes him very difficult to replace him. In saying that though, no-one is irreplaceable and someone will come and he will be talked about in a similar way as we do about Gerrard.
He is irreplaceable, there will be no other Gerrard, there will be no other Ronaldo, there will be no other Zidane. These players come once in a blue moon, its tough to take it in of course but he will never be replaced