They might do that, but our only chance of stopping this is to protest now, if we wait there is no chance they will change their minds, once a "BAME" Ciri is cast they won't be able to get away with recasting without facing backlash from the opposite crowd. However, if they change their minds now, and open up the casting to white girls as well as "BAME" girls  (I really hate that term, BAME, it seems offensive to me to lump all non-white races together in a single group, like they're purposefully trying to trying to stir up controversy between whites and non-whites), then they can safely cast a white girl by saying that she was the best person who auditioned for the role, without stirring up controversy from the opposite crowd.

I assume this 2nd paragraph isn't aimed at me, because I never said any of that. I'm not against more diversity in movies/tv, what I'm against is changing the established race of characters just so they can check-off the diversity checkbox on their list. That kind of forced diversity does more harm than it does good, it comes off as a transparent attempt to pacify those that want more diversity in media. If Lauren and her creative team on this Witcher tv series really wanted more diversity on the cast, she would create some new characters who match lore established dark skinned races like the Zerrikanians, instead of changing the race of an established main character, which is exactly what she said she wouldn't do just a few months ago. 

Would a casting call really need to provide an explanation? 

Are you trivializing the importance of employment?

I’m mocking the faux-outrage over this non-issue of a casting decision.

DEY TUK YER JERRRRRBS!

Would a casting call really need to provide an explanation? 

Sorry but when you aren't willing to open and accept you have 0 ground on calling anyone wrong, closed or anything and you showed that the first post you made.

That's largely irrelevant for something like acting.  A role may require someone be short, pale, female, purple hair, small chest, etc...   You can't call discrimination on everybody else who does not match that description.

And the concept of taking a job suggests someone else already had it.  in this case, it would mean that a white girl had to already be cast and then a BAME was hired to replace her.

Read my question again.  With a casting call, do they really need to provide an explanation?  Again, it's a casting call.  how many casting calls have you seen where they explain the plot and circumstances of the story?  None.  Because they are irrelevant to casting actors.

Do the fans want an explanation?  Sure.  But you don't get one with a casting call.

1. But that's irrelevant in a casting call.  The choice of the character and what they should or should not look like has already been determined.  It's a casting call.  Not a story development meeting.  That's already happened.

2. Again, that's irrelevant in acting.  A BAME didn't take a white girl's job because this was never a white girl's job to begin with.  By your logic, any choice is a denial of all other actors who are not that choice.  Need a male, denied all females.  Need someone tall, denied all short actors. Need someone athletic, denied all large actors. Need someone light skinned, denied all dark skin.  Need someone beautiful, denied all homely.  Need someone who can sing, denied all non singers.

Let's go back to point 1.

1. But that's irrelevant in a casting call.  The choice of the character and what they should or should not look like has already been determined.  It's a casting call.  Not a story development meeting.  That's already happened.

To expand further.  The choice of this character now having darker skin has been finalized and the explanation for such is not going to be given at a casting call.  The fans may want an explanation but a casting call is not the venue they will receive it from. It just isn't.  If it bothers you, contact the production company and ask that they provide an explanation for the change.