I agree that there's a potential for people to lose their sense of purpose when they don't need to struggle to survive. I expect that we'll find that AI is much better at psychology than we are, in a similar way that you can't look at your own eye, using a human mind to study a human mind is probably not the ideal way to study psychology. If we don't really have to worry about sustaining our bodies very much ever again, people might find purpose in the friendships and families that they develop. We might develop relationships with AI that are as fulfilling, or moreso than relationships with other people.