That was the analogy I was thinking. And yes, it is ridiculous that they retained the names, yet are casting white people. It is pretty blatant whitewashing, probably because the producers figure that Americans would not flock in droves to see a movie about a bunch of Asian kids (although apparently, they are making everyone adults [ugh]). Maybe it was based on ability, but I don't know...if you saw those The Last Airbender, for the leads the casting call was for "Caucasian people, then everyone else", I don't know what the casting call looked like, so I can't say.
I would also liken this to if someone made a documentary about Eminem starring Morgan Freeman as "Marshall Mathers" and it is set in Toronto (or a Manny Pacquiao movie starring Joseph Gordon-Leavitt).