Originally Posted by Fudgie
I'd say people said the same about Sean Connery as James Bond. Downey's great, but he can be replaced.
Maybe he can.
But the thing is with Tony Stark, the audience is already aware of Downey Jr's interpretation and anyone remotely trying to match his charisma on screen would be viewed as copying Downey or being no where near as good as him.
I feel bad for the guy next in line, it would be like filling in the Joker's shoes after what Ledger did. Downey made himself a household name with Iron Man as did Ledger with the Joker. Marvel fears replacing him.
EDIT: yeah, Marvel may need a sacrificial lamb for Iron Man haha