I think you're on to the one thing not mentioned here, fun. Trade/General/LFG and the forum is filled with recruitment notices this summer. WOW is just not fun for a lot of people. The demise of one of the best endgame guilds anywhere because they had seen it all and done it all is a case in point. That's something of a generalization but it wasn't fun for them anymore.
I'm lucky. I've added three more people to my guild because we are not afraid to be fun or to create fun while doing instances or endgame content. I guess I would want to know if Neur's GL is involved in the planning of other guild events or is s/he primarily involved in the endgame progression raiding. Just as "all work and no play makes Jack a dull boy", all endgame raiding and no break to do something else makes a guild a grind factory. Maybe Neur's guild needs to step back and do something completely different, guild dueling night, PvP night, instance night, where the emphasis is NOT on raiding or progression and just on fun. The week doesn't have to be about gathering mats to make things so you are equipped for yet another assault of insert latest instance. I have found that mixing the silly with the serious means people come to the next serious raid more relaxed and more willing to wipe several times in order to learn a fight.