Hard drugs is more a problem of the homeless than the wealthy. I’m familiar with your arguments having seen them in narrative form when I read Vonnegut’s ‘Player Piano’ but I think it’s a sort of stockholm syndrome we suffer from being shaped by a world in which one must work to survive.
I think if that requirement were removed, some people would struggle to find purpose, but others would already have a purpose outside of work that work was keeping them from. Creating art of various kinds, inventing, hobbies, performing etc.
So work wouldn’t stop, exactly. People would just be able to choose to do a form of work that they find enjoyable instead of having to do whatever they can find an opening for.