For data on how Japan might cope with its shrinking population see posting dated 4 December 2015 Robots and foreigners rise to the rescue as women marry later.
Japanese population projections are a matter of great political sensitivity. Whenever government is presented with best- and worst-case scenarios it will put forward that showing the least shrinkage.
Population clock (somewhat optimistic version, based on 1,000 years to depopulation)
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