Earlier quoted context omitted.
Why wouldn't it be? Humans have infinite wants and needs. These change overtime in terms of taste/perception as well. So the counter point should be made as to how this isn't the case and that a "growing pie" is actually against human nature.
It's the compound interest problem. If you keep compounding growth, like growing GDP at 1-2% a year, within some few thousand years you've grown bigger than all the resources within a sphere the same number of light years in radius. So clearly, growth is not sustainable and must eventually slow down until it approaches zero. To be clear, we're far away from that today. But the parent is mathematically correct, the be…
Would be super interested to see your math. What are the inputs and equation that get you to these specific outputs (a few thousand years, all resources, a few thousand light years)?