Okay, I'm not exactly happy about this, but I do think everybody is overreacting just a tad. I highly doubt they're going to go with Jesse McCartney, and I will not believe it until it has actually been confirmed. There really is no way of knowing how an actor will behave as a character until you actually see the movie, and with the exception of skin color, Sokka and Katara's actors are decent visual matches. Direction, costume, make-up, that has a great deal to do with how these actors will portray these characters. Yes, Avatar has the charm point of having no Caucasian characters whatsoever, but in an American movie, we could hardly expect that to be true in the adaptation. I'm just saying, we need to wait and see.