I'm planning on learning Haskell myself when I get a chance.
I'd recommend watching this talk on youtube:
"GOTO 2018 • Functional Programming in 40 Minutes • Russ Olsen"
One of the main points of the talk is actually how functional programming is only going to grow and become more widely used in the future.
I believe it, especially since massive projects like Cardano (one of the largest cryptocurrencies) use Haskell to benefit from its mathematically provable nature.
Currently as I understand it, knowing a functional programming language to an expert level does give you a leg up in the CS job market for those companies whose code bases use (or can benefit from using) functional programming, as everyone and there mothers knows Javascript, Python, C#, C++, etc. But functional coders are much more rare.