I agree that this won't solve the problem, but saying it is borderline racist? C'mon, let's be serious. It is not about white people telling black people what they can and cannot say, especially since the rule would be about anyone - black, white, hispanic, etc. - saying it; it is about the NFL trying to take a vile and racist word out of the game. Again, it won't solve the problem, but I think it comes from a good place.
CrimsonSunrise's post about it was really good, especially when looking at it from a HR point of view. In this day and age, when so many look to be offended by anything, why not do everything we can to get people to not say a word almost everyone considers vile?