Which is just another reason why the aversion to immigration on display by such large parts of EU society at the moment is just so freaking dumb and counterproductive.
I agree with you, but you can't just change the demographic makeup of any territory without some resistance from the native population. Push back is to be expected. You can tell Europeans "your people will go extinct without this", the rational response would be to accept it, but people aren't always rational.
Well, population decline doesn't automatically mean extinction. Eternal growth is not possible. The system should not rely on perpetual population growth.
Population decline due to low birth rates has never happened. Population declines have always been due to disease or war or something like that, taking the adults and leaving a young population behind. It's not about a system, an aging population with low birth rates probably amounts to population collapse, but we are in uncharted territory and can't know for sure how it plays out.
Well, let's wait until the Boomers go into retirement and the economy really crashes, due to the lack of manpower. Maybe some people will change their view on immigration then.