“I don’t think that anyone’s ‘nostalgia’ is going to be bothered by a new product featuring a Black Ariel.”
Have you seen what happened to Star Wars?
Disney’s other live action reboots have a mixed record already.
Just watch the old stuff that you love!
These people are in the business of making money, and that’s the bottom line - even though they often have screwy ideas of how to do that. They’re not in the business of creating or continuing myths for you to attach to and live by. They don’t give a damn about what you may cherish.
Ignore what you don’t like; enjoy what you do. And, perhaps, you could try to create the kind of inspiring thing yourself that you’d like to see in the world.