The only place facing a massive population drop in the future is China and for all the bluster none of the big dogs are particularly threatened by environmental

The only place facing a massive population drop in the future is China and for all the bluster none of the big dogs are particularly threatened by environmental/climate change (if anything they'd save money by focusing on mitigating it's effects locally rather than globally). Even resource depletion is only really a problem for nations of little consequence. So it doesn't seem very obvious that any of the things you're discussing are actually on track to cause the sorts of disruption Rudy your describing.