Well, we’re way, way over the overpopulation limit, with too much environmental destruction in our wake, so I guess it’s all pretty academic at this point.

Also, I certainly don’t find that a high-tech, capitalistic civilisation is required to maintain a society with high happiness & quality of life. We already know due to multiple encounters with existing primitive peoples around the world that people can be perfectly happy, content and occupied with far more primitive tech, without money.

That said, primitive societies can also be quite violent, stressful affairs, too.