It became very clear in the period 2006-2008 that predicting the details of collapse is impossible. This was when conventional oil supply peaked, and nearly all the Peak Oil futurists predicting that the price of oil would go sky high and stay that way. What actually happened was that the oil price crisis triggered an accident-waiting-to-happen in the US subprime mortgage market a global banking crisis, which caused the price of oil to collapse, not least because people in the US began to change their behaviour (driving less). Accurately predicting the future would also require foreknowledge of the behaviour of people like Trump and Putin, which is impossible.
I am in broad agreement with Peter Pogany.
The purpose of the above fictional history is to imagine how a paradigm shift on the scale we are talking about could actually occur.