Racial diversity in the films

How will today's obsession with racial balance in casts affect LotR? The books are dominated by white men (or dwarves, elves, hobbits, etc.) along with some white women. All the people of color (the "swarthy" easterlings and Haradrim) are villains, and that might not be acceptable in today's PC world. However, if there were black heroes, that wouldn't necessarily fit in with LotR. And what about Asians?

Is this a problem? Should there be a racially balanced cast of heroes despite the descriptions in LotR? That certainly seems to be the trend. In a recent production of "You're A Good Man Charlie Brown," there was an African-Am. Schroeder and an Asian Linus, and in Disney's recent production of Cinderella, there were familes with all sorts of different ethnic groups.