This is the case for any economy which relies on the easy extraction of cheap but ultimately finite energy/resources. Debt is a human constraints that could be

This is the case for any economy which relies on the easy extraction of cheap but ultimately finite energy/resources. Debt is a human constraints that could be erased by a the stroke of a pen. Sure with political consequences, but civilization have endured these kind of consequences before. Debt have been erased, new currencies erected. Once you run out of oil though... You can't legislate for tractors to run on good will to feed the planet. I am way more worried of actual physical constraints and the consequences of reaching them (ecosystem collapse, political extremism, wars) than our self imposed idiotic economic models.