If producers and big corportation are so set on pushing messages and diversity then why don't they make their own fantasy show? Tolkien based his work on Medevial England/Northern Europe naturally the characters and their appearence reflect that. Make your own fantasy based upon the demographics of NY city (who's stopping you?) if thats what want, but don't come and change and force you're politics on someone elses hard work.
I guess everyone knows that Anne Bolyn was secretly of Sub-saharan descent