This also ignores the growing middle class in China and India. Countries will have to be quality of life competitive or they will experience brain drain to the west.
Even the state of politics dating back to the Grachi. Gradually becoming more violent and turbulent and Rome's reach and power grew. A society of adapters who could no longer adapt to the fast pace of change.
https://www.wombatfoundation.com.au/wombats/
https://sydneyzoo.com/animals/common-wombat/