Demographic collapse is hardly unique to "the west". Have a look at the population age histogram in China, South Korea, and Japan.
I don't think that in a 10k ski-town there aren't kids. They definitely got 'young' people living there having kids.
I was reading the Systemantics yesterday and they discuss how a 'system' does not 'solve' a problem, but it breaks it down to smaller (easier to hide) problems. The book uses as an example the "garbage collection in a town", and how this one-big-problem breaks down to 100-small-problems. So the "we need rebalance our fiscal blah-blah" eventually breaks down to "no extended leave for new mothers", "not every doc-specialization in towns below 50k", and so on.