This phrase has always struck me as incredibly optimistic. Reading that it's been used for over 100 years reinforces that belief.
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?