I think that's what should be done. Replace ALL Indian mascots with White mascots and see what they have to say about that.
Then the Indians will get mad that they are being ignored and demand that they be made mascots again. BTW, it must be only a small group of activists who get upset over Indians being mascots. I've never met any Indians who really care about this issue. Come to think of it, I've never met any Indians who call themselves "Native Americans." They either refer to themselves by their tribe or call themselves....Indians.