I cleared 11/12 HMs in both 10 and 25 quite a while ago. Not that my progression has anything to do with my argument. I'm guessing that you're a 9/12 normal mode guy that thinks he's entitled to an Arthas kill at this very moment because you pay your $15 every month.
There are multiple servers with pugs clearing 10+ ICC 25 normal modes and pugs clearing 12/12 10 normal. Maybe not your server, but that doesn't mean that no pugs are capable of clearing past 4/12. But can you tell me where Blizzard said that everyone should have killed Arthas by now? The scaling buff is there to ensure that you eventually kill Arthas. There's nothing that says you should be able to kill him at 10%. Why would the buff scale to 30% if everyone was capable of killing him at 10%?
Fact of the matter is that nowhere does it say that Arthas should be dead by now. That's your opinion but in the end, it's just that, an opinion. ICC is supposed to last until Cata is released and that's months away. There is no way that 100% of raiders should have Arthas dead at this point as Blizzard wouldn't build their raids to do that as they would lose massive subscription numbers from people quitting in the run up to Cata. Content is gradually defeated, with the best doing it first and then so and so down to the worst of the worst. There has never been a killing of a boss by everyone on the server at once.
Have fun derpa derping your way to epics with your scrub guildies. Cata won't change your skill level. You'll still be stuck banging your head against the same encounter and that is exactly why this change is pointless and unneeded. Raiding can't possibly get anymore accessible than it already is.
It's funny how the people advocating this change think that this change will let them clear all the content. Why would it be any different than it is now? If you can't clear 10 man Arthas now, you won't be clearing his equivalent in Cata. Who am I kidding? Blizzard's way of making 10/25 the same difficulty will be by making both faceroll easy. :
