well nobody can replace big B in whatever he does. but then considering his illness, i think AB'S BABY will do justice. he has the style and speaks well. is witty and is the country 's fav gen next !
Well there is no one who can even match his style and personality but anyone who comes near to it is no doubt but his own son Abhishek Bachchan. Abhishek will rock like his father on this show if given a chance, as he is the next superstar of Hindi Film Industry.(Mind it I am not using the word Bollywood as Senior Bachchan hates it) I have been Mr. Bachchan 's fan since I was a kid and have many letters from him which till date I have been able to save . At the end once again I will say its only Abhishek & Abhishek who can replace him at KBC.
in terms of committment towards profession and perfection, only Aamir Khan comes close to Amitabh. He also has a knack of making ordinary things look extraordinary and has the variety to create a visible difference. if anyone tries to emulate the Big B's style, it might misfire. so what is needed is a fresh approach and that can be provided only by Aamir.
I personally think the best replacement for the Big B is Siddharth Basu. The rest cannot match up and I am afraid without Siddharth the KBC programme could fall flat on its face.