Promote guild hopping over bonding with friends? Lolz. If you and your friends have a common goal - be it clearing heroic raids, running mythic dungeons or kissing squirrels - that's great. No one is forcing you to do anything. If you and your friends like to do mythic raids at your own pace - great, do it, go for it. But when your motivation differs, and you decide you want more/better progression while your friends are ok with things how they are - things will go differently. It goes for real life as well, work, sports, almost any aspect there is.
75% of the end content is available for the majority, you can do mythic dungeons, raids of heroic/normal/lfr difficulty, pvp. We are talking about a specific TINY portion of that endgame content
which is supposed to be the most difficult one.
What signs are you talking about? Amount of guilds having killed bosses got lower? Yes it did. Do we know why? Nope. For all i know most of them had some irl issues and couldn't contribute to raiding often. And unless someone does a pretty big survey - we won't know the real reason why.
Harder to fill rosters? On low populated servers - yes, as it always been. I've been on low populated server till Cataclysm and it was a sh*t show when it came to recruiting even then.On high-populated servers recruiting is pretty ok.
It will be a farce when you start nerfing it to the ground, making the whole mythic raiding pointless. And i am pretty glad Blizzard do not nerf it until the end of expansion or close to it.
P.S. You can call me all you want, like i care if someone insults me over the internet lolz