The cultural elites (activists, media, academia, entertainment etc.) will never, ever, ever, ever, ever embrace the concept of transracial because it threatens affirmative action, quotas and other set aside programs for minorities. They can never give white people a license to identify as black, and they won't, the black activists in particular would never allow it.
If not for that the PC crowd would already be championing this made up nonsense of transracialism. They won't reject it because its nuts and illogical or because it comes into conflict with science and genetics, none of that stuff matters to the purveyors of PC, they love lunacy and the more illogical the better, but they can't be giving whitey a license to identify as black, pretty soon these honky's will be checking "black" on their college and civil service applications (etc.) and claiming transracial status when confronted about it.
So the PC Police will have to trot out their activists masquerading as experts (academics, psychologists, sociologists etc.) to explain why its perfectly reasonable for a man to identify as a woman and visa versa, but completely illogical and immoral for whitey to identify as black. In fact if you are paying attention, that little kabuki dance has already started.