I think it's a very interesting concept having the whole raid and heroic instances not immediately accessible but requiring enough dailies to be done for it to be fully unlocked.
You can't just get 25 people in full T6 to walk in and clear it for a server first. This is an important point.
You actually need to work with the rest of your server. If your guild has been farming Black Temple since it was released... you still can't walk in and get a world first kill on the first day of the final raid boss.
If your server is pretty crap, you might even have to wait a while.
Sure, all the good players and their alts might be able to help speed things up...
But the fact that the quests are dailies mean that you can only do (quest that unlocks 0.0005%) once per day. It's going to take a while. A lot more than one day. A lot more than one week even.
My guess is the requirements will be so high it's going to take a while, and be high enough to reflect the server as a whole, rather than 50 people with no social lives.
Which, in my opinion, is a good thing.
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