I played on the Zuluhed/Ursin/Andorhal/Scilla realm group. I quit raiding in BoD/CoS. My guild transferred off, and so did several others. I logged in a month or two ago to feel out the servers. There is only 1 alliance guild raiding, we were a horde majority by 2 to 1. The horde guild still raiding have been 4/8 for 3 months.
https://www.wowprogress.com/pve/us/connected-zuluhed
I didn't transfer with my guild (which actually ended up dying on Thrall a month or two later when classic came out), and went on to classic, where we raid 2 hours a week tops. The raiding in Mythic is dead on the outer realms. And even if I wanted to raid with the guild raiding, there is no way to communicate with them. In warmode I don't see anyone from my server, there is no discord, our realm forum is a ghost town, and the connections I knew left long ago.
The game isn't dead, its on life support for raiders. Classic helped people realize that the "casual" life is what they've wanted for years. They don't want to log in every day for hours to grind something that means nothing 77 days later. The don't want to raid an entire tire which is INVALIDED the next patch. People have been raiding MC every week for 16 weeks now almost, and they still haven't seen their piece drop, but they don't care.
Mythic raiding killed end game. Getting together 20 people instead of 10 or 25 destroyed raiding in my opinion. Bring bag end-game 10 mans. That is how FFX14 has been doing it forever, 8 man end-game raiding. Getting 7 others together is much better, and easier to replace dropouts.