What are you talking about? The author of A Wrinkle in Time was white. So the characters were not created by African Americans.
I actually met the author so yeah, I'm aware she was white. I speak of the adaptation by Disney via the "director" Ava DuVernay, whose adaptation was garbage. She made changes to the story, not to enhance it for the screen, but to push her political agenda. She thought the characters were too white. She thought the storyline wasn't woke enough. She filled a thoughtful, imaginative, emotionally-driven tale with unnecessary preachy "empowerment" tripe. Thus ruining it. I have no patience with that kind of crap. I CAN see the issues with the original film "Song of the South". But I agree with Whoopee Goldberg that the film should be shown. There is much that is very good in it. A little judicial editing would, IMO, solve most of the issues some have with it. I think it's better to do that, so that new generations can enjoy the film's magic, music and James Baskett's Oscar-winning performance, than burying it and pretending it never happened. Same with Splash Mountain. The Oriental Land Company, BTW, has no intention of removing the Splash ride from Tokyo Disneyland. They apparently think we're being very silly about the whole thing. I agree. And I think it's hilarious that Iger can't do squat about Splash remaining in the best Disney park in the world. Yeah! Pound sand, Iger!
As for African-Americans writing original stories that can be adapted to Disney rides and shows, naturally I'm all for it. But I have the same standard for that as I do for all creative things: the material has to be good. Like Walt, I "take my hat off to talent". That's all that matters to me.