Universal Basic Income might have some viability even if it resulted in millions of additional unemployed. The Pareto principle is a real phenomenon in everything. As long as the economy is sufficiently privately owned, high achievers will probably still achieve highly even if doing so harder and even if low achievers achieve lower and low-middle achievers achieve less. UBI could also create positive social/economic disruption, resulting in new types of goods and services. It would make the most common kinds of labor and human capital skills less viable, but it could possibly create some new areas too.