I am sure Shahrukh must be dying after slum dogs release and success since he refused to do the film...this guy has actually turned some great roles down like munna bhai etc..
truth be told - SRK cannot act outside his comfort zone of romance flicks... Swades and Chak De are two exceptions but even those roles weren't exactly something unique.
It takes guts to try something new every time... Aamir is perhaps the only versatile actor who accepts risk and gives his projects his full attention to make sure that he is successful with his new ventures.