You've got to get obsessed and stay obsessed

I certainly hope you're right! I just am also remembering that time Lavender Brown was played by a black actress for the first five HP movies and then was replaced with a white actress once she became a love interest for Ron and got a proper speaking role. (see here) Presumably JKR knew all along that Lavender was white, but either wasn't actually very involved in casting or didn't see any problem with that turn of events, which was a weird one. I suppose if I felt like JKR was really aware of representation and determined to stand by it, I'd share your optimism. But, sadly, not that convinced. So, fingers crossed, but limited optimism on my part.