I like the sentiment, but the actual thing used to cut people into the value of that economy has utility that can be priced in terms of that actual thing.

Imagine you lived in an economy where all you had to do was pay robots in the required electricity to gather the requisite resources (from somehow politically uncontested, infinite stores), assemble them, and deliver the product to you (or you to your destination, etc). The cost of storing that electricity, and transferring it to them would be accountable in electricity (the purchase of the manufacture of batteries in electricity, the electricity losses due to transformation and heat loss on the wires, etc).

Humans have thus far been really bad at amortizing the costs of the actual things they're transacting with. It may be impossible, but Bitcoin is the first system that seems to have attempted a solution.