First noticed this in the 90's. Companies were desperate for X windows (Unix GUI) developers, until they weren't. Few people knew the tech. Those who did saw the writing on the wall. Nobody new had time to learn it before it went away. But there were applications to maintain.
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Are you talking about Cobol or Java?

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Python2? :)
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My dad is currently converting COBOL to Java.
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We are currently building up to a huge generational migration from cjs to esm currently too
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"Where there's muck there's brass"
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FORTRAN... it’s so true
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I accidentally used a B&W roll of film (in the days we had rolls). And when I sent it in for development, I got an unexpectedly high $ charge.
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