Hunters and Warlocks are the same class. There is no difference in the core concept between us. The major differences spawn when you break down the core concept. Which is Player has ranged dps capabilities while a pet does the tanking or kiting.
This breaks down into two concepts Spell ranged or Physical Ranged(I know some hunter abilities are spells what ever)
But the core gist is Hunters and Warlocks are the same concept. Hunters have a tanking Pet tree, but the class not tank. Warlocks have a tanking tree(voidlord/wrath guard in certain areas) But we can not tank.
My point is this, the concept was not to be tank but a pet class that can if needed take some hits. But we are in no way near a "tank" so this idea should die off. IT is retarded and anyone who says that locks can tank is blindly repeating faulty data that can be proven wrong any time and any day. It is easy have to prove.
Take a raid into any current raid...
have a warrior/pally/Dk/druids be the tanks, and then the second raid gets locks as tanks. Watch and see who is successful and who fails miserably. THen come back tell us that locks can tank.