>>213920076
No country has ever actually allowed depopulation to run its course in the long run, they all caved to mass migration before the population ever significantly dipped.
Even Japan only experienced a dip of 5 million from its all time high before it now started allowing migration.
The only example I can think of for cotinued depopulation is Ireland and as we can see there, they were still able to rise later and become a good country again.
Which they probably wouldn't have been able to do if they had frantically tried to replace the lost population with brownoids from all over the world