Must say, I find it funny when people compare kill numbers to ask for nerfs, considering you have no idea how many subscriptions there are right now in the game.. for all we know, maybe there's just 20% less people raiding now than in HFC.
And for the record.. my cross-realm OpenRaid alt run group is 9/11M and doesn't count as a guild on WowProgress.. so even if you check the amount of guilds that killed it, you completely forget about the heroic cross-realm groups that finally could access mythic content.