There are two wealth in this world: financial wealth, and demographic wealth. Both are limited by natural resources, so it should come as no surprise that they are declining. Humanity will be confronted with the principle of reality.
The reality is the universe is infinite and so are its resources. So in the long run, it’s unknowable if we will fail to harvest them. But there is no innate limit.
What is demographic wealth?
I'm guessing a population that can generate wealth (think age distribution, education).