^ Pegg is basically Q in the Mission: Impossible movies anyway. And Firth apparently used to really want to be Bond. Even without the Oscar, can't imagine him settling for the role of Q.
But I agree that if the character re-appears he should be closer to Bond's age than he has recently been portrayed. He was more like an older brother to Connery, Lazenby or Moore. It was only with Dalton that he suddenly was an uncle/ father figure.