It's not so much that OOP is falling out of favour, but that functional programming in particular is being rediscovered, probably because we have to multithread now, and if bugs are hard to keep out of single-threaded code, they're nigh on impossible to keep out of multi-threaded code.
In fairness, a lot of us never truly embraced OOP anyway. I've always avoided objects unless I'm managing state. Even in OOP languages, much of my code essentially repurposes objects as modules for storing functions. The fact that they are implemented as methods is incidental. This is not an uncommon pattern.
I'm stronger with OOP than I am with functional programming because I've been doing OOP for longer. I started out with procedural programming when I was a kid (BASIC and QBASIC), and have since moved on to PHP, Javascript, Python and a bunch of other stuff.
Almost everything I've worked on in the last 8 years has involved OOP in either PHP, Python or Perl. Perhaps I stumbled into a niche and have yet to find my way out, but OOP has been a common theme in my career.
No, you stumbled into the mainstream. The wholesale migration to OOP was complete by the end of the 90s.
But you've probably been doing functional programming within OO languages and not realising it. For example, most of the PHP standard lib is functional. In fact, PHP is really a multi-paradigm language. Python is much closer to a pure OO language.
No, I do realize that PHP in functional. I suppose I misstated my history a bit - I went from procedural to scripting languages, to functional to mostly OOP in languages that support both functional and OOP.
I would say that Python isn't closer to a pure OO language than PHP, rather it allows for more pure OO than PHP. I only say this because you can go pure functional in Python as well.
In fairness, a lot of us never truly embraced OOP anyway. I've always avoided objects unless I'm managing state. Even in OOP languages, much of my code essentially repurposes objects as modules for storing functions. The fact that they are implemented as methods is incidental. This is not an uncommon pattern.