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I don't want to interrupt this nice tribal "capitalism vs unicorns" rant, but...
Decline in demographic growth is primarily a threat for social pension systems, where generation n pays pension for generation n-1 from their employment taxes.
If you had 10 employee contributing to 1 person's pensions say 50 years ago, and in 50 years it's going to be 1 employee, you can imagine it won't work.