Let's face it. Blizzard thinks that this is practically the end of Wrath of the Lich King, if you didn't get everything you want by now, sucks to be you. It's over, and you've had ample time to kill everything that you want to kill.
However, they don't take into account that not everyone is satisfied with that, and yes, I know it's impossible to please everyone. But in all honesty, who are they pleasing by implementing the new raid system now? Not me, certainly. I was working on H LK 10m for the longest time with a group of incredibly good friends of mine, whereas my 25m isn't "GREAT" but still relatively fun, and we're 7/12 H ICC 25. They're my guild, I go with them above having fun working on H LK in 10m. I miss it : \. I really do.