Of course, consider the classic trend of those who want to "raise a family" (in the family planning sense) arbitrarily move to areas of less population density than were they came from.

Hasn't it always been this way since the very first cities in ancient Sumer? Cities are population sinks that need continuous replenishment by migration from the country side.

Urban sinking never ends. Rural population has always been source of supply even in today's post-industrial age. At end, it is farmers who determine people's characters in long run.