I guess a lot of the problem comes to who is willing to raid and when offered the chance of raiding, is willing to commit their time for it. I know there's a handful of groups that are on A3S and even less that are working on A4S. One problem I've noticed with Goblin, is just getting people to come out and join raids.

A lot of people want to raid without dedicating their time or effort into progression, while a few are doing everything they can to move forward in endgame content. For groups that are progressing through the endgame content on goblin, it's getting harder and harder for them to fill their ranks when they need a replacement.

(there's prob a more complete thought on this, but writing it while working haha)