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It seems that some functional programming languages are hard to sell to management due to the limited adoption, talent pool concerns and integration with existing systems and code. In the case of Clojure, despite being able to run in the JVM, Clojure has a unfamiliar lisp syntax to most Java developers and is dynamically typed which makes the life of IDEs harder since dynamically typed languages are hard to refactor, hard to figure out which types a function returns and so on. In the case of Scala, Kotlin seems to eating its launch due to be borned with full tooling support from Jetbrains and endorsement by Google on Android. In addition Kotlin is FP enough without over-engineering and compiles faster than Scala. Regarding the F# the problem might be that most tutorials about .NET platform are in C# and most codebases are in C# and Microsoft does not promote F# in the same extent as C#. Moreover C# is getting more in more functional features.

More and more languages are adding support functional-programming features, including Java, C#, Swift, D Language (DLang), Rust and also C++11, C++17 and C++20.