That's not the lesson your monologue gives: It's, men are valuable as long as they make something. Which points to the problem, if his skill-set can no longer be monetized (replaced by automation/AI, or a lack of; tools, seed capital or demand), his future is living under a bridge.
It's very practical to avoid "economically useless" but most of us enjoy something first, or at least, enjoy learning about it, then learn to get good at it. Then there's industry lobbyists pretending they need more people to do X: So, the government funds a training scheme where employers take 10% of graduates and dump the rest into unemployment. A decision to avoid economically useless activities, doesn't guarantee avoiding economically useless activities.
... capable, interesting humans.
Most of the world is geared to the humans capable of paying you less and keeping the profits, then using the profits to steal what you already have. Forbes is full of 'this unmarried mother made a million dollars' stories. It's selling the truth that getting your first million requires hard work (plus other things they don't talk about), and the subtle message that employers don't want to give you a stable income, so start a hobby that you can monetize.
At some point it stops being capitalist efficiency and market forces and instead, is a vicious circle designed to keep a few people, wealthy.