At this point... they should really consider nerfing SoO in the fashion of 20% less HP and Damage to everything. I killed Garrosh HC like 6 months ago, i find the place boring already and personally we are still raiding to get every mount for our raiders (we also sold some mounts ), so right now, any kind of nerf to us is a blessing because it means that we spend less time doing something we no longer enjoy.
Also, a nerf like that bring life again to a raid tier, at least for a while, making the raid easier makes it more doable with alt characters and somehow brings some new interest to the place.
In the past the mistake they made was nerfing too soon, now it seems that the mistake is not nerfing at all.