It’s my opinion that a complex society requires ever more energy inputs to maintain its complexity. If the energy inputs consume the fabric of life that sustains the overall supply of energy that is being consumed then complexity is finite. If we are at peak complexity and peak-energy availability then decline occurs. It’s likely that decline will be abrupt for the most complex parts of society first. The least complex arrangements of humans in a societal arrangement will survive the longest during a general collapse. There will be blood.