Overclocking died the moment it went mainstream.
It kind of mirrors what happened to computing in general.
It used to be you REALLY had to know what you were doing just to BOOT a PC. You needed to have some functional knowledge of Autoexec.bat and Config.sys... as a MINIMUM.
There was no such thing as support... so you had to troubleshoot a variety of problems on your own.
It was the same with computer building.
You needed to know how to set your RAM timings to get them dialed in... and even your CPU speed. All KINDS of things.
Around the time they switched from a regular bios to UEFI... all that went to hell.
It's been so many years since I set my RAM timings I'm not sure I even remember how to do it. And CPUs, generally, overclock themselves.
Hell... Every computer I've built in the past ten years or so has been MORE than powerful enough for whatever I'm trying to do.
I was never in it to compete with people who were using dry ice or some kind of extreme cooling (although I did have one of the the fastest E6400s in the world at some point...). I was in it because I had limited means and wanted to be able to process video faster.
Now I can do video, audio, 2D, 3D, and every conceivable thing right out of the box.
Also the core overclocker community moved on. The weirdest of the weirdo's was able to find a wife, start a family, begin raising kids, get a business going, start playing Minecraft... whatever.
No more hooking up a tube to the output of an air conditioner in the basement to get another 10mhz out of a CPU to move up one spot in the rankings.
i actually went three years without even HAVING a desktop computer. And, frankly, I never really felt like I was missing anything.
Technology itself was a huge factor. Like I said... the parallels between computers tech and overclocking... Once computers themselves went mainstream... laptops became extremely powerful, easy to use, and against-all-odds... cheaper.
You buy this little all-in-one package, turn it on, and it could do whatever your desktop did. Maybe slightly slower... but who cared?
It's all those things put together plus the world becoming a place you REALLY needed to keep your eye on.