I'm not so sure. I can imagine a scenario where you have a set of large companies that control entire supply chains and essentially function autonomously. A single megacorporation could run every part of the process from extraction of natural resources, to refinement, to production, and ultimately for consumption by a vanishingly small group of individuals at the top. It would kind of be like a giant oil state but almost entirely self-sufficient. Money, in the end, is just a number in a computer system. If you can manufacture everything you ever need without human workers then currency doesn't really matter much. There could still be growth in output and capability once the system as a whole becomes self-improving.