I agree completely with Earl, my brain sucks at processing things and whatever so I was not able to defeat Vellfare's argument convincingly (and I do think there is something wrong with her for thinking it's not racist), but I still believe the movie is racist. 
The racist argument falls on the assumption that the current cast were chosen because of their race. Considering the main bad guy went from being a white dude to a brown one for no reasons other than conflicting schedules with the actors, it actually seems to me that the people in charge don't really give a shit about race! It's not fair to have all these people saying this little boy with a lot of talent shouldn't be in the movie for not being Asian. I don't know about the other actors but there's no evidence that they were chosen for being white in place of an equally talented Asian. No one has this evidence at all! The only thing anyone has is information that they asked for "Caucasian or other ethnicities", which I agree is pretty stupid, but that doesn't disqualify Asians whatsoever. There is zero evidence that this casting was done on racist grounds at all, it's all just one big assumption.
Also psyburn has said himself that it sucks that the only asians in film are the ones doing kung-fu shit but this movie IS kung-fu shit too so I still don't see why this is the one to rally behind, if it did have an asian lead it would still be THOSE ASIANS AND THAT TYPE OF FILM THEY DO, it's not advancing anyone in any way that didn't already exist bub
edit: Plus I mean consider the casting process, they did casting calls all throughout the United States, a country where 70-ish percent (I think) of the population is white. If they picked out the best of the best from each location, there's a really good statistical chance that a lot of them would be white. Think about how many 12-15 year olds watch this show that would want to be in this movie, you'd have to be retarded to think that the majority is Asian. There was a good chance from the start that the lead would be white.