I'd say we should distribute it across age groups, but this lets you use the existing Social Security Infrastructure. Plus, young people don't vote in legislative and local elections, so that wouldn't be as useful for preserving the freedom to automate.
You have to go one level deeper with something cloneable, but there is still scarcity.
The cost of a downloadable audio book is going to be based on maximizing the return based on its demand curve (since the supply curve is vertical).
The demand curve is going to be based on the scarcity/cost of an equivalent value audio book (if an audio book is $1000, you'll probably buy a different one from another author instead). Thus, this ties back into the scarcity of supply, which is tied to the scarcity of labor (skilled in this case) to generate that supply. There is a certain amount of labor required to become skilled (and to a lesser extent scarcity of talent), and more labor to produce an audio book. This scarcity of labor keeps audio book prices from dropping to zero.
Plus I'd imagine a large spike in people who write novels and other arts. Other humanities and R&D can fill the void for those not gainfully employed. Which contributes to the progress of society.
Ok. Are you going to be the one that has to give up their job forever?