We should definitely go all in on a perpetually growing population, what could possibly go wrong.
It's going to hurt, but that's what happens when people don't look to the future and do everything out of greed. The sooner we stop population growth the better.
This "greed" and lack of foresight underpins a lot of the welfare states of Europe. Many member states are doing nothing at all to account for this population shrinkage, much less plan for a world with less people.
Unless your welfare state depends on a growing population. Which is the case in many EU states.
I'd also argue that overpopulation is not a problem in Europe.