Sean Connery could have been... Gandalf (The Lord Of The Rings)
The Part: The wise old wizard at the heart of the Lord Of The Rings saga, and now also The Hobbit.
How They Would’ve Played It: “Good morning Mishter Bagginsh. We leave at sunshet.” Etc. etc. Why We're Glad They Didn't Get It: Sir Ian McKellen’s dulcet tones are now inseparable from the character. “You shall not PASH!” wouldn’t have worked quite so well.