Art is a service. I’m more curious about what people would do to get any of the things that are currently “the economy” when all needs are oversupplied by, say, a mere 5% of the population in full time work. Would people work less for the same goods? Would there be high unemployment? How do things shift and rebalance? UBI sounds good, but is it politically feasible — some people get called “benefit scroungers” while others are called “pensioners” and “the royal family”?
Perhaps artistic pursuits in space :)
Humans don't take boredom well. They'll find something to do even after all their needs are fully met.