Y'all should checkout Deep Utopia by Nick Bostrom. It's about exactly this conundrum. He's fairly rosy though about our capacity to find meaningful human interaction and activity in a "solved" world. Though some things we do for purely instrumental reasons might pass away, there's still opportunity to engage in what he calls "autotelic" activity, things we do for themselves. Like playing games, jockeying for hierarchy, sensory experience, ritual, crafts, etc. His other book, Superintelligence, is also pretty interesting--looking more at dark AI scenarios, paperclip maximizers etc.