See that's exactly the thing. We can point to excess today and say "How could that be sustainable" but it seems like the novelty would wear off, no? Like in some hypothetical future where resources are 1000x more available, would people launch 1000 cars into space? It seems unlikely. Somehow I feel like there is some inelasticity to consumption that we just haven't reached yet. I'm not quite sure why I feel like that though.