A post work world exists for the majority of humans on earth. That's why we are growing much too fast; China and a lot of Asia will be unemployed in the future (Foxconn firing their employees in favor of robots will become common with robot prices falling) (not to mention the move back to to west for several branches/markets, but even without that); most people in country X (not only China) can simply do nothing more than repetitive labor and those will be done in the future. I wouldn't give that 100 years.

What 'we' (of the HN crowd) will do post-work is easy; we will make new work. That's not an option for most (I'm not sure if it's 99+% but I guess it is). Happiness in a Federation (Start Trek) utopia is not very hard to imagine for people who have hobbies and passions. With real holodecks it's probably not hard to imagine for people with less ambitions or passions, but that's so incredibly 'not here' yet...