A defacto ban is "We're removing it from our reading list, removing it from our library... but we not discouraging our students from reading the book". Removing it from a reading list isn't a defacto ban, it's modernization. If the kids at a specific school don't seem to respond well to a text, PULL IT. I don't care what text, even if it's one of my own beloveds just PULL IT and put in something the children will read and will learn from.
Brave New World is a classic, beyond perhaps, but if kids today aren't learning from it then so long. For every new book that goes on the list, an old one is going to come off of it. I'd much rather see kids get something like Monstrous Regiment by Terry Pratchett that they'll respond to. Fuck, give them Harry Potter or a goddamn Halo novel if the kids will actually read it.