IRC as a concept has never been healthier. Lots of alternatives, most proprietary, some libre, and more users than ever.
I'm not trying to be difficult, I have used IRC since the 90s and still use it. It's just the best format for chat imo.
But my observation is also that it's dying slowly.
Is it? I'm not on it every day, but I don't really notice a change. Isn't it just that it isn't growing, at least not as much as the explosions of web-based, proprietary platforms like twitter or slack?