Black Panther: Hollywood is the Winner.

Were it not for the exertions of the producer, Fred Weintraub, one of the greatest, some say the greatest,  martial arts films of all time would never have been made. Or maybe would have been made in an obscure corner of Hong Kong, certainly without the financial and commercial power of Warner Bros behind it. And it would have taken cinematic martial arts a long, long time to emerge from the narrow alleys of Hong Kong. And Bruce Lee would never have become the global figure and icon he became: restricted only to the oriental fame that he gained with his roles in previous films such as 'The Big Boss'.
You wouldn't blame Warner Bros in being reluctant to listen to Weintraub. Omar Sharif had delivered big in Lawrence of Arabia and Doctor Zhivago but such success stories were few and far in between. Perhaps for the first time, studio supremos were being asked to cast not only a non-white, non-Caucasian male in the leading role of a major movie, but a Chinese as well. Bruce Lee had made his breakthrough in Asia but even though he was an American, the stardom to break into mainstream Hollywood hadn't yet arrived and his Mongoloid features were certainly going to work against him. Of the cast, only John Saxon and Robert Wall fit into leading acting stereotypes of the white, Caucasian male. Jim Kelly was black even though the role of Williams was not meant for him in the first instance. It wasn't racism, Warner Bros was a business venture and were merely following the first strict rule of entertainment: 'Give your viewers what they want.' It was perhaps a measure of the strength of the studio execs' skepticism that the film was first released in Hong Hong and not the United States. If it was going to succeed, it was going to need some special, convincing performance, goods which Lee and co effortlessly delivered.
In the intervening years, the Sean Connerys,  the Schwarzennegers,  the Travoltas were to rule the box offices but perceptions were changing and demography even faster. The internet had turned the world into a truly global village and from India to China, non-Americans were increasingly having a bigger say in what to be viewed and what to be produced. It was therefore not surprising, the rise of the Jet Lees and Jackie Chans. Soon, blacks like Will Smith, Dwayne 'The Rock' Johnson, Samuel L. Jackson were being cast into leading roles and promptly delivering blockbusters.
From Dwayne Johnson, the next step, huge step would inevitably be Black Panther. Cinema having been seen not to regress with blacks in leading roles, having been seen to rather attract viewers in droves with black frontmen, it was inevitable that a movie featuring mostly a black cast will be the next star in the firmament. Black Panther has all confirmed that  and there is no doubt more of it will be trending in the future. And you can bet it wouldn't only be spin-offs. We would be happily seeing more of Chadwick Boseman and Lupita Nyong'o and co-travelers in casts that would not need acting stereotypes to be forced into it in order to sell or projected to do well. And as usual, it will still be good business for the big studios. Give the people, the viewers what they want. It is now a much varied world.