I don't understand this view. Every time I see people spending hours of their time watching harlem shake videos or any other silly nonsense on the web, I am heartened that there are infinite jobs in entertaining each other and providing "non essential" services. OK sure, robots will take over construction and heavy lifting, leaving only a "super class" of surgeons and whatnot still able to get any of the jobs we recognize today. But I think we are far away from robots taking away other very
human jobs. I pay for a twitch.tv subscription so I can see StarCraft games in 720p+. I literally pay other people to play video games. This is not some strange oddity, this is the future.
Remember: once upon a time it was a full time job for just about everyone in a society to get food, take care of children, and just generally do the bare minimum to survive. I'm sure they look at the world we live in today as "post-scarcity" the same way we imagine a world of tomorrow where robots do all of our duties. When agriculture introduced surplus into our society, it didn't cause a collapse. It instead allowed art and science to be born. Just as those early humans would have scoffed at Michelangelo getting a paycheck for putting colors on walls, so to does this possible future seem frivolous to us. But it is no more frivolous than all the current people employed in our current economy convincing each other to buy things we don't need.
If or when machines do everything we consider essential now, I assure you we will find new things to do with our time, some will be better than others at these new things, and thus we will pay each other to do them.