Before governments started heavily funding scientific research in the 20th century, most basic science was done as some wealthy person's hobby. Of course there were far more aristocrats who were interested in using their moneyed leisure to (e.g.) race horses than to experiment with electricity or identify new insect species, but some were driven by curiosity. (If you remember the Web in the 1990s, there was also a lot of amazing creativity that found an outlet via personal passion-sites that had nothing to do with earning an income.)

If nobody really needed to work I think that's it quite possible that the huge population multiplied by a tiny percentage of people spontaneously taking up a creative pursuit (science, music, writing, mathematics, sculpture, animation...) could provide us with a "creative class" of a decent size. How many contemporaries of Henry Cavendish were born with comparable latent curiosity but left no scientific discoveries behind because they had to work in the fields all their lives instead of inheriting wealth? I personally stopped pursuing scientific research and started writing software (very little of it truly novel) because the wages and employment situation are so much better with software. If I didn't have to worry about income ever again I'd spend more time on truly novel interests. It's kind of sad if other people would use their newfound freedom from waged labor to rot on a couch in front of the TV, but not so concerning that I'd assign them a self improvement life-nanny.