The nature of the physical economy is changing. With so much automation, it's all about who can innovate, engineer, and organize. The need for masses of workers of ordinary skill is dwindling away. On the one hand, this means more stuff with less work. On the other hand, it means the stuff mostly goes to those who can do the kind of work that cannot, not yet, be done by machines. A lopsided income distribution, where the bottom half of the workforce earns maybe 5-10% of the earned income, is socially disruptive. Can we really expect the "takers" to be content with their earned pittance?