Good Question. I'll Explain it to you, in few Simple Points why less and less people choose this role.
So You got a Group of Mobs to tank. all of a sudden you see
"Changed Target" "Changed target" "Changed Target" "Changed target" Threatening Presence
on Minions, Pulls mobs away from you constantly when u trying to control them into Harmful AoEs for Mobs, or bosses.
Hell... every time tanks sees "Changed target" its a bit of a stress because Now you gotta let go of focus on 5 mobs u have on you and chase that one to re-taunt it because who knows it might be going for a healer, and my priority of tanking is keeping attackers off of healers and DPS to make a job easier for healers, Therefore Healer always got mana to get you up at tough times.
And Plus every time you Tell a warlock to turn it of, he'll f%#*ing fight with you about it and tell you how it is off, when that "Idiot" cant see the buff on His Minion. Its getting really annoying to having to deal with that Sh*t.Growl
, Same flipping deal as Warlocks Threatening Presence, for Crying out loud, Its really not that Hard to right click the spell and change your pet into a DPS Spec.
With that said, and in Addition, when u r trying to take that moment to tell a noob politely to turn one or the other off, in order to protect DPS and Healer from taking unnecessary dmg, You'll Have them telling you also to not be " Cry baby" or " QQ Moar" or " Quit your B*tching"
Its really demotivating when you are disrespected by and yelled at by very people you are trying to protect.
So really its Not the Mechanics of Tanking that are drifting people away from tanking, its the people you join a group with. Its Those 2 "L33t" wannabe kids sitting holding hands from same realm who all of a sudden got B*lls to disregard you and your role, and argue with you every step of the way.
I got 3 tanking toons 2 of which are at max level, and I've Fought those people every D*mn day. Up To A Point where I Just no Longer tank in LFD. I Love tanking for My Friends in <Epic Raiderz> When we're 5/5 or 4/5 in LFD,
Or When we 're raiding on weekends, there is no Better feeling than Having to tank your Way through All of MV10 or HoF10, because you know if not for your effort, not for your concentration, timing, None of this Would have been Possible. When you one shot a boss, or which ever you do. There is No way around it with out a tank.
Yet the respect and understanding we get from people is obsolete.
And that, is why Less and less of people want to tank, Not Because its hard, But Because of People, that would rather fight with you about it rather than just Turn off Taunting buff/Spell off, and resume in a calm environment Raid/ Dungeon.