TBC is what destroyed WOW. I started playing in 2005 and when TBC arrived, almost all the biggest guilds in the world started crumbling or disbanded immediately. This happened to my guild on Crushridge (we were 2nd guild in that server).
The reason was: the green items you gained just doing pathetic quests in Hellfire Peninsula were better than T1 or even T2 items. People that raided hardcore content (Ch'tun was INSANE at the time, not to mention 4 Riders in Naxxramas) was so pissed of that just quit.
Releasing TBC on Lordaeron you just took again the wrong route. The same route that has doomed retail wow.
The greatest raids in this game were in vanilla: BWL, Ahn Qi Raji and Naxxramas, all 40 men, were the real wow experience.
The only great raid in TBC was Kharazan and, again, when you'll release WOTLK on Lordaeron, Kharazan will be irrelevant too.
Of course I understand all your efforts until now have been towards making wotlk as good as possible, so I can understand your actions.
I still miss the real old "vanilla" wow, that had Naxxramas 40 as the final and greatest instance ever done.