I think you mean that human society will always need services from other humans. Your argument doesn't convince me though. How will people know about new, bett

I think you mean that human society will always need services from other humans. Your argument doesn't convince me though. How will people know about new, better items they could be printing out - presumably like now through well designed websites, or in the future perhaps 3d animations, voice interfaces or robotic demonstrations. Or automated home delivery of items for trial purposes. Even if we can't replace the creation of marketing materials and new designs with artificial intelligence entirely, it's not clear that there will be significant demand for workers. The risk is that those people doing jobs nobody wants to do eventually will not even be able to do that to earn a basic income. At that point you have increasing pressure to provide welfare benefits for these people, which is unpopular among those who don't fall into the disadvantaged categories that you list.