Earlier quoted context omitted.
And if you really want to boil it down to a single reason, the best candidate would be "becoming militarily dependent on hired mercenaries and then not paying them" rather than something more interesting
I can see that happening. Thinking about Canada. The other day I calculated it would take 25 hours of work for the minimum wage worker to afford a weekend camping. And I think that's a pretty good indication we're pretty close collapse. Workers not being paid enough, and out of control inflation is how the soviet system collapsed.
Now if I were to live in Edmonton again, I could probably still camp as if it were free but I appreciate your assessment that a minimum wage worked could not. Because I certainly could as a minimum wage worker back in the day. And I probably would never justify a domestic hotel type weekend or week long trip within Canada.