So because white people made lots of shows starring white people for decades now there needs to be representation in everything? Black Panther and Crazy Rich Asians did fine reaching wide audiences without any of the real leads being changed to white. Do black and asian people not watch shows starring white people? I genuinely don't get how this only works one way.
Here, I'll explain.
Firstly, it was never about shows starring white people. That wasn't the problem. It was about whitewashing. I.e. putting white people in roles that were technically not roles of white people. Johnny Depp in the Lone Ranger, Jake Gyllenhaal in Prince of Persia, Ben Afleck in Argo, ScarJo in Ghost in a Shell etc.
Secondly, no. There doesn't
have to be representation in everything. But when the production studio chooses representation is some shows/movies, it's a bit of an overblown reaction to lose our collective shit over it, isn't it? There's still shows made with almost exclusively white cast. As there's shows with almost exclusively black/asian casts, as you pointed out. These aren't a problem either.
Thirdly, there have been
plenty of shows where none of the characters were supposed to be white but were added in for representation or appeal to the "mainstream" (i.e. majority white) audience. So you don't have to get how it only works one way... because it simply doesn't.
At a personal level, I like the Witcher franchise and understand how it's a mostly Slavic-inspired medieval-themed fantasy world. But I'm not gonna go ape shit if Ciri is a mixed race kid or what not. It just smacks of people that are either over-sensitive or looking to get angered over something.
Or maybe, you know, they could just go the all human cultures are multi-racial way, which is both the easiest, most inclusive, and least problematic in every way
Most likely scenario.