How does your notion of post-scarcity square up with the laws of thermodynamics? Even if you have vast amounts of capital deployed the amount is still finite and thus en masse has a finite capacity to transform a finite amount of energy.
While I can imagine having such great amounts of capital deployed and resources available that maintaining an unbelievably high standard of living for the average person could become vanishingly small, I find myself also believing that, with such material available, even grander plans requiring still even more resources would be concocted, plans that could only be achievable at the limits of what would then be available. Plans of that magnitude would be operating under conditions of what we might call scarcity, that is, they would require in those undertaking them the ability to economize.
What do you think?