Producers Looking For New Bond Already?

While speaking to "SKYFALL" actress Naomi Harris let slip that the studio behind the Bond franchise are already looking ahead for the next actor to take over the role of James Bond once Daniel Craig leaves. Craig recently confirmed that he has signed on for two more films after his 23rd adventure as the British secret spy. Harris named British black actor, Idris Elba and said that he had recently met with producers about a role in a future Bond film(s). Elba has been rumoured to be a extremely strong contender for the role and he said that he would love to get the chance to play Bond.
Here's what Harris said about Elba meeting with the producers,

"I didn’t realize that there was this talk and then I did a film with Idris [Elba] and he said that he met Barbara Broccoli [James Bond producer] and that it does seem like there is a possibility in the future that there could very well be a black James Bond. And I would have to vote for Idris because I just finished working with him and he’s a great guy."

I personally think he would be a great James Bond, but how would you explain the sudden change in the characters change in skin colour? You can explain it when it comes to The Doctor regenerating, but Bond, you can't. Elba is 40 and by the time Craig finishes off with his final two films, Elba could be about 45/46 at the most and by that time could be too old for the role. I still want to see Michael Fassbender get the role though.