I've read a lot of interesting things here, but no post really covered my perspective, so here it is: Reason 1: Object Oriented Programming becomes less popula

I've read a lot of interesting things here, but no post really covered my perspective, so here it is: Reason 1: Object Oriented Programming becomes less popular. After the 90s people started to see that OOP is not really the solution that scales to unlimited complexity. It was a step forward but nothing more. Many different things got tried, like Aspect Oriented Programming, but none of that really stuck. Reason 2: The moment we had processors with more than one core we suddenly had a need for general purpose parallel processing. While the solution to this now seems to be using tools/frameworks like ZeroMQ, another reasonable option were languages with different paradigms, like functional. I think that both these things happened nearly at the same time got a lot of traction to functional languages. I am following this since 2008, though. That functional languages still didn't make it to the top of popularity currently results in me no longer believing that they will ever be. Functional languages always had this kind of swingy popularity where a small group of people where strong hearted followers while the general opinion always swings between "this is ridiculous" and "maybe we could use it for that use case". All in all I would say, the question is a great one, now that the current renaissance of Functional programming is pretty much over.