Well, let us agree that the reason why they had to have attunements for TBC was because they were giving out a ton of raid content all at the same time and needed to (wanted to) guide the progression through the content. 5 mans to 10 man to 5 man heroics to 25 mans (Gruul / Mag / SSC / TK). They were afraid of people skipping Gruul, and Mag and going right into SSC/TK and finishing before they could get BT/MtH up and polished.
No previous raid zone has required 200 man hours to attune members. MC (5 man quest in BRM), BWL (15 man UBRS run), AQ (event/none), Naxx (rep/gold/mats, 1 man). I think the precedent has been set and the attunements will be changed/removed as the “finish line” gets moved out 10 more yards.
If they do not “remove” them, I do think that requiring 15-20 members in the raid to open access to the BT/MtH each raid as reasonable. Most guilds are still going to need to get at least 1 kill in on the end boss to have the number of attuned core members required to maintain access to the zones. Attrition could still force the guild to return to up their numbers of attuned people to have the 15-20 required. It removes the need for T6 guilds to attune each trial member and keeps T5 guilds from skipping the bosses at the same time. It also removes the period in the middle for T5 guilds where they spend 2-3 weeks getting all the alternates attuned as well. (credit Caducus for the idea)
Would 20 attuned people form a raid just to “open the zone” for a guild that was not attuned yet? What if the process had to be repeated every hour if you had to run back?
I find it hard to discuss ways to make T6 guilds happier with recruits when those same T6 raiders are holding up that they just want it easier for them and don’t want the attunement process to be more forgiving to the T5 guilds. I think the fact that people go from Kael to full time T6 bosses within 2 weeks shows that the peak at the end of T5 is broken in terms of overall progression.