Well, you have to also consider that non-white protagonists do exist, and when they do, what is pictured above happens—they die. So, this is, although harshly put, predictable to me, because it's just a little reminder that whites usually do come out on top in the media, whether it be through the antagonist or protagonist. That sounds a little nitpicky, but think about it: In mixed-race plots, how often does the non-white win? And on top of that, how often are they the protagonist?
I don't watch many movies (less than ten over the last five years). I do see your point, though, and I acknowledge that could have handled this picture better. I thought maybe I could be an exception since 75% of my fantasy protagonists are brown to begin with. They also all survive and win their respective struggles.
I am also just sensitive to this phenomenon, because people who look like me have few media heroes that look like us to look up to.
I know this doesn't mean much coming from a white guy, but I hate this as much as you do, and I'm trying to help. If Naomi's Story ever gets a movie, I'll do all I can to get an actress who actually looks like Naomi to begin with rather than get a white girl to play her.
(And when the protagonist is supposed to be non-white, the role is often altered to accommodate a white actor. For instance, why on earth is Johnny Depp allowed to play a Native American man onscreen in The Lone Ranger, as if there aren't any Native actors?)
I suppose this is both because of Johnny Depp's popularity and because the majority of America is still racist to some degree. But you already knew that, and that was a rhetorical question.