If someone other than Nadal, Djokovic, Federer won a slam it would be a huge thing.
Indeed, it will. However, I am not overly optimistic he will win a slam in 2013. I think RG may be his best chance (may sound a bit stupid for his later on lol), provided it's nice and sunny like in 2009 and he finds his form and is not injured. A lot of ifs but winning a slam nowadays is never easy except for Novak and Rafito.