I came across a forum post about guilds who killed Illidan 8 months ago. Essentially they are beyond bored and have warned Blizzard that they will not wait another 8 months for new content.
Lucky for Blizard no other MMORPGs are close to release. You sometimes see mention of WAR, but I haven't heard anyone mention anything about the Pirates or Tabula Rasa MMORPGs come to think of it and both of those are out already I think. At least LotRO got a little bit of publicity before dropping off the radar - too bad they didn't have their higher level content fleshed out ahead of time.
We've had a few guilds clear everything before the beginning of this year. You don't really hear them say they are done farming yet.
The guild I'm in is still in Black Temple/Mt. Hyjal and they have a ways to go before they clear both from what I've heard. And this is with the more dedicated players in our guild. They are kept busy with that and Zul'Aman and don't seem a bit disgruntled.
And we have several guilds still in Serpentshrine Cavern/Tempest Keep mostly stuck at the end boss humps. They are kept busy actively recruiting. Although you see some players trying to jump ship because they recognize this will be the bottleneck until either those bosses are nerfed or attunements are lifted.
Why is there such a divide in groups who can clear all new content within a matter of months, groups who may clear most of it in the time span of a year or so, and guilds who will never get very deep into 25-man instances without extensive nerfs and removal of attunements?
And Blizzard has to try to keep them all happy. If you release content faster, the slower guilds feel like they can never keep up - and lose their better players to better guilds. If you release content slower, your more progressed guilds get bored and irritated and people stop playing the game altogether.
Why did they release SSC/TK at the same time they release BT/Hyjal? Maybe they should have spaced them out a bit more, made the bosses harder. Slow guilds wouldn't have noticed (because they always get nerfed eventually) and faster guilds would have been kept busy longer.
1 day ago