There's no need to keep jamming new worker bees into the hive....
Agreed. Demographic decline is not a big deal at all, although there is the issue looming in Poland that there will be simply no-one to pay for those Ponzi scheme pensions that they're depending on. Germany has chosen immigration, and it appears that Poland is doing the same.
The new challenge is to figure out a way to make economies work with fewer and older people.
Meanwhile, the Polish mentality is that early retirement is something sacred and that women cannot possibly work beyond 60 despite their life expectancy reaching towards 80 now. I'm not sure they even want to figure out a way...