Classic misunderstanding of programming languages. The only thing stopping cobol from being "known" is these companies paying for it.
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Not moving forward with the software industry is a weird kind of conceit that separates these companies from the mainstream by far more than money.
But it will take much more than that to learn the gnarly codebase in use in those shops...
And that is a skill that is certainly not transferable.
There's a comment in this thread from a former consultant that completed a 4 week COBOL bootcamp before being sent to a client to write code!
Why is this input file loaded and rechecked 3 times? Because 30 years ago a file load failed, breaking end of quarter reports. This was the fix: if we can read that file three times and it doesn’t change then we know it’s good