I'm advocating basic income, not "everyone does what they feel passionate about". After this one very important socialist reform, we'd still have an essentially free market. In fact, we'd have a freer market because people would be free, not forced by poverty to work. A lot of people don't have much vision or passion and would prefer doing things for money over not doing anything and settling for a lower-middle-class lifestyle. So the toilets would still be scrubbed, because people would pay others to do it.

On the other hand, the people who follow their passions would be merely living on not-very-much, but not at risk of starvation, long-term underemployment, medical bankruptcy, et cetera.