The concept of worker is out of date.
With regard to employees today, the market does nor require workers. The market increasingly requires thinkers.
Those physically fit but mentally lazy are unfit for the current workplace.
There will always be openings w/ those of strong back and weak mind, but just not as many. No problem, the fact is that people on average are getting smarter from year to year anyway (re: Why our IQ levels are higher than our grandparents').