Can the decline of morality truly render right/wrong as indistinguishable

Most of us know the stories about the fall of the Roman Empire. In part, it was attributed to a decline in morals and ethics. It is the mainstream belief of historians, that this led to the eventual inability of the Roman people to distinguish right from wrong.

Do you believe the societies of tomorrow void of morality and ethics could suffer similar inabilities. If not, what tools and/or knowledge do we posses that could make these two principles be considered decadent ideas?

Would love to hear what you all think.