My gut instinct tells me that this isn't racist, because the NFL generally rewards based on performance (though the same old tired names tend to be recycled, though i dont think thats a race issue.) But there are a paltry amount of minority head coaches for whatever reason. If there were great black coordinators constantly getting overlooked, that'd be one thing, but I dont think there are? Then again, I guess you can ask the question of why there aren't so many black coordinators and so on.
But of course society is still racist...thats not even a question.