So looking back at the final bosses in every expansion since Vanilla, we needed help to kill them.
I'm talking about in the final raid of every boss.
In BC: We needed Maiev's help with Illidan.
In WoTLK: We needed Tirion's help (aka miracle) with the Lich King.
In DS: We needed all the aspects + thrall + the dragon soul to help with Deathwing...
So...who or what will help our raid kill Garrosh? Because God forbid they actually let an entire raid take down something without NPC help...