the falling away was predictable because building the church of man was more important than the revelation of Matthew 27:51
IMO,the Church of man is being built every day with every new denomination/nondenominational/"liberal" RC church that opens it's doors. All churches have been touched by the influence of man, so the question really is whether the influence was divinely guided or not.
Not to get sidetracked, but see my reply to a post in which I give my opinion on the influence of man on the Church. Reply concerning Foursqare Church