Yes, there was an era that changed comics forever with a couple of black characters. Now we have more diversity, but, as the original article quoted and the entire point of this thread, some retailers don't seem will to accept that there are different people than them in the world. These are the people that make these comics accessible to the public.
Or, as Jimmy asked you, was this just another Rich Johnston click bait story?
Good read: http://nerdist.com/marvel-diversity-comics-david-gabriel-wrong/