The rich get richer and the poor have children. It is possible to increase quality of life almost infiniytely, but not if it is defined only or even primarily in material terms. But the essential problem with GDP is that it measures only economic activity. On the other hand, it completely ignores all family and volunteer activity, without which the world would grind to a halt in hours rather than days. There are many examples of aboriginal societies which lived in stable adequacy for hundreds or even thousands of years.
Societies can collectively choose abundance by limiting population.
The XSSR refutes this notion conclusively. The Land Tax is a great tool. I am astaunch believer in it. I believe that it is a necessary but not sufficient answer to the myriad problems that confront us. Hopefully we will learn to limit our numbers and our waste before we destroy our habitat.