When it comes to movies and T.V shows based on comics or popular novel series, it's going to last as long as it's profitable. Lord of the Rings and the Hobbit did very well in theaters, Game of Thrones was insanely popular, so every media company is going to rush to create the next hip series based on a novel that most people haven't even heard of before it became mainstream.
This will work up to a point, but how do you think the reaction would be if Peter Jackson was trying to make a LOTR film and they turned around an insisted that at least half the Hobbits, Elves, etc, be diversity hires. GOT last three seasons suffered from lazy writing and the inability of the showrunners to hand it over to people who would be more involved in giving it a decent send off.
No one I know disliked the fact that there were POC in GOT because it reflects the source material. All of the characters whether Dothraki or Meereen, or Ebony Islanders fit the description of the world and the expectation that the reader had.
Instead of what most script writers seem to be obsessed with, which would equate to the Starks being black for no particular reason, and why not make all of the Iron born Latinos, because they're under represented too.
It's getting to the point now where this diversity shit is not just insipid because it's being done for two reasons, one of them is the invasion of what is seen as a classically white male space. (Fantasy and Science Fiction) by neo-marxist and their puppet millennial ancillaries. But it's getting to the point now where it is going to actively harm the franchises they're purporting to help.
The Witcher is a great example of this. I know people who love the series of books and games, who won't be watching or are skeptical to watch the series now, because of all of the artificial race mixing/casting bullshit.
It's actively turning fans off of watching new things, and there is a point to this.
I won't watch anything now that has any of this sort of shit surrounding it, and I know a lot of people who won't either. You don't want your favorite characters maligned by some gender studies drop out who thinks they're going to change the world by making superman a disabled female gay black latino, don't watch. Support the properties that take care of their characters.
And the easy excuse would be to turn around and say "Oh you don't like POC as characters cause your a racist."
Wrong. If anything I agree with the sentiment that they're under represented in the industry, and if anything we should get more shows that have a diverse cast of characters already built into the story, or at least make the brave choice of addressing the fact that there are differences between the characters, instead of this weird utopian ideal that in a fantasy realm there is no racism, no sexism, no homophobia, etc, etc, etc.
A shining example of how the industry cuts of it's nose to spite it's face is one of my favorite TV shows is a historical drama called Shaka Zulu, it was an 80's TV production and filmed in South Africa and basically succeeded despite everyone trying to get it shut down, because interaction with the South African film industry at that point was seen as supporting apartheid. 80% of the cast is Black South African, the lead character in the series is a black, and manages to not only become a tribal leader, but essentially build an empire of the Zulu. The white "colonialist" characters in the series are basically in peril throughout the entirety of the series, because it's only by Shaka's will they're allowed to live or conduct their business.
It's a well made, well written and compelling series, which is why even after all this time like Shogun it remains a well rated mini-series, even though half the actors never worked in TV again after because of the boycotts that followed, because they'd worked in South Africa. And because no one wants to actually address the subject of colonialism now, because millennials are taught that the mission work and empire building of white Christian nations was somehow something to be deeply ashamed of an never discuss again, or hope that at least the majority of people will maintain the ignorant malaise of not going a bit deeper into the subject and realizing that what they're taught on the subject versus reality of the history surrounding it is woefully inadequate.
TLDR; Another fantasy series that will gather dust on the Netflix catalog.