Late stage capitalism is the last descendants of humanity fighting over the angular momentum of the last remaining black holes 10^100 years from now, not any of this nonsense.
Asserting that an ad hoc system of markets and currencies is the pinnacle of economic achievement is pretty bold. To provide a counterpoint, why wouldn't our economic structures change in response to interplanetary/intergalactic civilizations? Will climate change have zero impact on the way we organize resources?