The falling away is already taking place. Man has decided to go against God and define how we shall govern ourselves. Man has also decided to change multiple things, one example being marriage. God set up that a man and a women shall marry, that is the biblical definition of marriage...now it is pretty much anything goes.
Matthew 24:12-26 "And because lawlessness will abound, the love of many will grow cold. 13 But he who endures to the end shall be saved. 14 And this gospel of the kingdom will be preached in all the world as a witness to all the nations, and then the end will come."