Morality under objectivism runs the risk of becoming fluid and in a state of flux. In fact relying on mankind to mantain some adherence to moral behavior demands for this to happen. What is moral today may be immoral tomorrow and what was immoral yesterday is moral today. Social morality can not survive in a state of constant change and when morality dies so does society. Examine the decadence and immorality that contributed to the fall of just about every major society in history. When there is no common source of morality, no yard stick to define a standard of behavior, society collapses in on itself. Didn't Keats say that the center fails to hold? If I have no concern of being held responsible for my actions either in this life or the life after then I am more likely to do what feels good and is easy whether these actions are right or wrong. It starts out with small things and then I kill my neighbor because he plays his stereo too loud.
Why not? They law may not catch me and I have no God to answer too. Why don't I just do whatever it is that makes me feel good? Why do I need to concern myself with others who don't fill some need that I have? Why should I concern myself with your rights when those rights may infringe upon my happiness?
I've heard talk of a new moral revolution that was just around the corner. In the 80s and 90s it was called new age-ism, as in the new age of mankind. Man was on the verge of the next step in his evolution. This was just a pipe dream of those who desired something better in life but felt that a relationship with God was too constraining. Faith open the door to belief but reason and rationality support faith. I use my ability to reason to find reasons not to believe, but I find none. I look at the world with rational eyes and a logical mind and I see God handiwork everywhere. Aristotle and Plato reasoned out the existence of a Creator using pure reason, but now people say that belief is not compatible with reason.
At this point I have to ask. What gives you the impression that some moral change/revolution is about to occur? What signs do you see that lead you to believe that something that has never happened in the recorded history of man stands in the wings?