Back on the official DR&S forum, there was a thread that wandered into a discussion of guild poaching. A number of people said that poaching is not a problem now, because so many guilds are imploding that the better guilds that are recruiting can just pick and choose from the refugees. In the perception of these people, guild implosions were occurring now at an unprecedented rate.
To my mind, there is no doubt that (1) tough normal mode difficulty, and (2) LFR as a fallback if you want to "see the content", spells big trouble for the majority of guilds that attempted normal mode raiding this tier. I expect normal mode raid participation to be way, way down in T15.