But I'm also not convinced by your defence of Narnia. It's 4 white British middle class kids (Peter, Susan, Edmund and Lucy) who have the privilege of being sent to the country during a dangerous time. I'm happy that you were able to identify with these characters. But for the many, many people who prefer to read stories about people like themselves and can't identify with Peter and Susan, I'm glad there is something for them now.
It won't last though. When you're used to privilege, equality feels like oppression. For people who've enjoyed characters who look just like them, who've grown up with experiences just like theirs, any change feels like oppression. See the vicious backlash to any female or gay or non-white video game character nowadays. Game, book and movie producers who want to play it safe will go back to white straight males to avoid that backlash.