We will continue to have growth until Humanity is living in dyson spheres with matter replicators, and humans are immortal Until then there will always be scarcity, and with scarcity you will always have new people doing more with less. If the trucks delivering your product go from human drivers to self driving trucks, there will be a lowered cost of getting your product into stores and increased productivity. If the local coal powered plant is shut down, and a new nuclear power plant takes its place and the cost of electricity for your business goes down by 8%, that is growth, that is an increase in productivity.