a) We're not working 15 hour weeks. I'd say that's mostly because people like to do things. Give people enough money to not need to work and they'll still want to go build stuff
b) His musician mate made loads as a lawyer, not much as a musician in spite of contributing more to society as a musician. That does seem to be a market failing. Gandhi types preaching peace and making a big positive impact can make nothing, patent trolls can make a fortune while screwing society. Not sure how to fix that.
c) "The ruling class has figured out that a happy and productive population with free time on their hands is a mortal danger" - not convinced by that one. I think it's a failing of the human mind to attribute what are probably emergent market phenomena to plotting human bad guys.