When I go to our realm forums, I notice that just about every decent raiding guild on our server, is clamoring for more people.
I've decided that T7 is terrible from a Human Resources standpoint.
Normally, a progression guild offers the unguided (or unhappily guilded) the chance to explore new places / meet new monsters / loot new items - in exchange for their exclusive membership and contribution to raids. When applying to such a guild, you accepted the risk of rejection, because the reward for acceptance was great.
At this point, with all ten man content, and Naxx-25 & OS-25 being PuGable - organized raiding guilds can only offer Malygos-25 and OS+Drakes as benefits; And it's not that hard for a fresh guild / semi-regular PuG to do Malygos-25 and OS+2.
When semi-casual membership in a mediocre guild can get you access to every single item drop and boss fight in the game - where is the incentive to move up?
In Vanilla/BC, most guilds got dashed against the rocks when they tried to enter T2/T5. Tough bosses (Vael, EverythingButLurkerAndVR) tested the devotion of many players, and guilds were broken. This kept the player base free and mobile. A guild would break up, its players would distribute to other guilds to replace their occassional losses, the cycle would repeat, and life would continue.
At this point in T7, there is nothing for a guild to break up over. No hard bosses in the way of "progression", no strong desire for the average raider to aspire to "Twilight Vanquisher". Whats more, the semi-pug-guilds seem super resilient to break up, since they ask so little of their members.
We end up with a multitude of just-big-enough to farm Naxx-25 guilds, with low enough entry standards to scoop up fresh players, that offer enough to keep the risk vs. reward ratio in their favor (people are unlikely to app to a guild that just has one more drake then them, for fear of losing membership & their weekly epic meal ticket).
I'm really, really hoping that the "added reward" for hard mode bosses in T8 is enough to increase the divide between what a guild with strong organization is able to accomplish, and what a semi-pug can accomplish - for the sake of all guild's health across Azeroth.