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I think it's clear to most people who build things that functional programming only appears in the wild when a programmer sets out to build something with functional programming. Those of us who are not taken by this hobby would never use it for anything.

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Functional programming is everywhere. Many aspects of for example modern Java also move in the direction of functional programming.

Those who never learn it are just stuck writing software in a more complicated and less readable way.

Learning FP and using it where it makes sense can do wonders to the quality of code you write. And over the past years many (even "traditional") languages have recognised and embraced that fact.

We use pure functional programming in production to manage airline pairing/rostering and optimisations. Each customer has about 150k lines of pure functional code running on their servers. Also, Google “Elm” for examples of a pure functional language being used in production by other companies and how Facebook and other companies use Haskell in production.

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