I don't see how the two are related. I don't think people find a great sense of purpose in a job if the only thing that job provides them is to not starve to death.
I'm not saying the current source of purpose is the best source. I'm just saying life is currently organized around working for most people. Something (or many things) will need to replace that structure.
Why should it be dissatisfying or why should people so easily adapt to the absence of that struggle?