Supply and demand. If the demand gets to high for your skill , your skill just might become obsolete.
Not to much demand for stone masons anymore. How about mathematicians since computers. Technology changes demand and creates other demands.
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Yep, and as the demand changes, the skilled need to be able to adapt enough to survive.
Adapting is one thing humans do best as a species. Individually we hate change. I guess that is some sort of balance