I've come to understand that

the morality and relational well-being of mankind cannot be reconciled through the means of politics.  This does not mean no government
is needed.

"The problems that exist in the world today cannot be solved
    by the level of thinking that created them."

in any case, any chapter of history since the dawn of time ought
to suffice as either proof or evidence.

discuss

Depopulation and affluence tend to come together. The more educated and affluent the society, the more expensive (in both physical and parental resources) it is to raise a kid and the less kids people have. The world will depopulate on its own, assuming that developing countries can develop. So depopulation is not the answer, is this what I am understanding?  

The ultimate ceiling to growth is finite resources. I seriously doubt that these resources will exhaust themselves so quickly as to create a massive crisis. Over time as resources become scarcer, the cost to procure them will soar and be replaced by substitutes, which will become increasingly cheaper yes? I do not see why the affluent will be undermined. If anything, focus of resources to the affluent will continue making them richer, while the lower classes will be further marginalised.