Yeah... marvels calling... they aparantly dont have a problem with that.. Nick Fury? Human torch?Ethnic minorities are prevented from playing white characters,
That said.. yes it is incredibly stupid to ignore the source material... anime most often is HEAVILY influenced by japanese worldview. To "americanize" such an anime for western audiences will only destroy what made the anime/manga great and apealing to people in the first place. Not only that but the whole story most likely will make absofuckinglutely no sense to anyone anymore. See the disaster that the now binned Akira project became.
And casting the wrong ethnecity for the wrong roles is allways a big issue.. and it doesnt matter what skin color or what gender. As soon as you disrespect the source material you might throw the entire thing into the trashcan.