Capital hoards benefits because resource scarcity and cost of production are a thing
Post scarcity societies would likely have entirely different dynamics
Transitioning to a post scarcity society requires broad, accessible dissemination of post scarcity production methods.
What was the first thing we did when we digitized media and therefore made it copyable at negligible per unit cost?
Spent a huge amount of time and money to artificially reimplement scarcity via DRM.
Scarcity-based capital interests (read: most) are not going to willingly give up their profit engines.
We're already physically running out of materials to cheaply build infrastructure. I'm not sure how solving the economy needing humans translates to humans having more things -- short of "turning off" the consumers to conserve resources, and taking the things that they may have otherwise consumed.