What motivates people in a society where all their needs are met? Competition for resources has long been and will continue to be large aspect of humanity as a species, but I imagine we could reach for a truly golden age once a large group of people have the luxury of thinking about things like we're talking about now. It'd be amazing what we could build if more people had time to experiment - possibly bewildering and dangerous!
I wouldn't say food, housing, health, and education comprise "all needs"...and I'm pretty sure the behavior of billions of people supports that. How many people earn enough to simply have food, shelter, and healthcare and then go "well I guess I have enough, I don't want a single other thing". Even the usual claim that "people will just spend it on weed, beer, and videogames" shows the clear desire for things beyond the necessities. _That_ is what would motivate people.
