What aspect of that do you want them to be concerned about? The bigger concern was population growth, it is nearly impossible for living standards to keep rising if the population is growing exponentially - at some point the number of new mouths overwhelmed the ability to produce food and some sort of underclass has to form. We need at least stabilisation at some point and it seems the easiest way to achieve that is to wobble between growth and decay.

We have all the tools for population decline to work out fine. The economy is run mainly by capital and it seems like we're decoupling military power from number of soldiers.