“The failure of any one of these will bring about the collapse of the other 2 within weeks perhaps even days, that in turn will bring about the collapse of civilization as we know it. not believing it will happen is not going to stop it from happening”- lonewolf
Well it took 500 years of diminished central control for the Roman Empire to end. It was more of a transition to localized power and authority more than anything else. Rome ultimately lost it’s tax and resource base. As Whirly often says “The Slow Grind”
If the grid fails that is entirely a different matter.