It would be difficult to completely rewrite the Bible to the point where Revelation was washed away. It would be easier to just ban it.
No less a man than Martin Luthor himself put Revelations (and Hebrews I believe) in an appendix!
Actually, they are rewriting the bible as we speak, little by little, with each modern version it changes more and more.
As for the Book of Revelation, you are correct, they will probably just replace it with the Shepherd of Hermes, which states that one ought to take the mark of the beast and those who don't are the wicked ones.