There is no doubt that Desmond Llewelyn can never be replaced. But, I believe that John Cleese was a good replacement. If a new Q was going to be brought in, EON couldn't have done a better job. I would love to see Q reintroduced to the series and I think Cleese would work well w/ Craig. If they do bring back Q and it's not Cleese than it needs to be somebody with a natural sense of humor (like Cleese) or the whole thought is pointless b/c the Q scenes were always good for a little comic relief.
Moneypenny isn't quite as necessary as Q in my opinion, but I do feel the character could work. They don't have to use the same "model" they used for 20 films (as in stereotypical scenes/dialogue). Integrating the character into the films w/ a modern twist wouldn't be hard.
Craig stated he'd like to see Q and Moneypenny return and now that this "new 00 agent" is supposed to be (from what I keep hearing) the James Bond we all remember, it's appropriate they be introduced into this modern era in a modern way.
EDIT: Wanted to note that if Cleese is not brought back I think Rowan Atkinson would make a good "modern era" Q. Though, it's probably unlikely.
Edited by 00 Brosnan, 20 May 2011 - 02:16 AM.