TLDR (b/c AI predictions are overhyped): "Fluctuation Exists" in systems (including economic systems, societies, mechanical systems, etc.)

A modern, industrialized, knowledge-centric economy is constantly having to re-skill. (It seems to be largely due to innovation, but I am just guessing.)

e.g. A new technology comes in-- creating a rise demand for skills to use it, and a decline in demand for skills to use what it replaces.

The dichotomy of skills entering into and leaving importance & scarcity is apparent via the following lists of occupations:

Fastest __Declining__ occupations in the USA: https://www.bls.gov/emp/tables/fastest-declining-occupations...

Fastest __Growing__ occupations in the USA: https://www.bls.gov/ooh/fastest-growing.htm