“Once it crashes, govts will no longer have the funds to maintain order.”
Economic activity never drops to zero, there is always somebody selling and somebody buying what they are selling. Oil and gas will not just magically disappear, the oil producing nations will always be interested in selling that oil to someone so there will be some energy available that can be used. Also, you had better believe that if people in cities start to get hungry that they will organize and go out and take (tax) what they need from the rural areas. You’ll be paid in worthless paper for you produce or packed off to jail if you refuse (they’ll leave enough for you to survive and plant next years crop so that they can take it again, or if really stupid do what they did in Zimbabwe and give it over to cronies and watch everyone starve to death).
The real danger is that you get some genocidal idiot in a leadership position who decides that there are too many people and starts systematically killing off the undesirables. There’s not much that you can do other than run to another country if that happens. Look at the Ukraine, Cambodia and any number of other places for those types of examples.
Just remember all the past small peaceful civilizations that grew up and thrived. Oh wait, none of those are around because they all got stomped on by someone bigger and more aggressive. Remember that when planning on going out to some small rural community on a small plot of land.
Reminds me of the U of TX professor Pianka who feels the world would be better off with 90% killed off by ebola.