Can you imagine Beatlejuice as a girl, The Three Amigos are all black, Chinese, and Porte Rican girls? The God Father becomes the God Mother. Patrick Swayze teaching a young teenage boy how to dance (Dirty Dancing)?
Some parts are just specific to certain actors. It isn't political, racists, or anything like that. It's all fiction. Just as there isn't a black superman, these classics just stick and the ones that continue shouldn't be touched. Even when they replaced some of the characters in sequels that doesn't even look like the original character really messes things up.