Ghostcrawler has been fairly active in the thread on AoE tanking, which has been filled with complaints from tanks that don't feel like they can hold threat well enough in multi-target situations:

Ghostcrawler (Link)

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Here are ways we could make AE tanking trivial. None of these are things we would actually do, though players have suggested some things dangerously close to them.

-- Challenging Shout has no cooldown. Everything is pretty much taunted to you the whole time.
-- You can tank everything by spamming Commanding Shout. (Back when say warriors tanked the pre-Nef adds, they could do it by spamming Battle or Demo Shout, which generated terrible threat but just enough to actually work on that encounter. Now it really won't work... but it could with the right numbers.)
-- Thunder Clap hits so freaking hard that you hit it once and never really have to again.
-- Thunder Clap puts a dot on everything (stronger than Deep Wounds) so that you hit it once and never really have to again.
-- Defensive Stance has an 8000% threat modifier.

Those ideas would all work if we wanted you to never lose threat. That's not the goal. On the other hand, the goal also is NOT:

-- Some tank classes just generate a lot more AE threat than others.
-- Some tank classes just AE tank a lot easier than others.
-- AE tanking gets harder and harder over time as dps specs gear up.
-- AE tanking is really, really challenging and you're at the constant risk of losing aggro.
-- Just for completeness, I'll add the original one above, which is that you never, ever lose threat no matter what.

What we like about the warrior AE tanking model that is worth extending to other classes without just duplicating the warrior abilities:

-- You hit more than one button.
-- You hit different buttons than you do when handling single targets.
-- You have to pay attention to crowd controlled targets.
-- You don't totally ignore your single-target abilities.
-- You might switch targets on some pulls.

This thread on AoE tanking has been getting quite alot of attention. The concerns about AoE tanking made me think about the evolution of tanking since I used to play one pre-BC.

I played a Warrior in vanilla WoW, and I've gotta say -- tanking looks pretty easy nowadays in comparison! Tanking without any sort of threat meter was a far cry from the extreme 3rd party modding available now where you can practically have mods tell you which buttons to press.

This post made me think of learning the Vaelastrasz encounter which required you to have 5 or so Warriors sacrifice themselves in an aggro chain while the rest of the raid furiously mashed buttons trying to burn through his then massive 999,000hp pool. Not knowing whether you had enough threat or too much threat was more exciting than trying to hold aggro on huge packs of trash.

I think it's kind of curious that tanking has devolved to the point where your greatest concern is how to hold threat on 5 different mobs as you smash your way through the now not-so-aptly-named 'heroic' instances. Blizzard may be taking the wrong approach to tanking -- I know people dread a return to Burning Crusade heroic instances, but perhaps a return to instances with more difficult and complicated trash that required crowd control, but with less trash to clear might spice up the game a little bit.

That'd be my answer to their question, do away with the long and boring but unchallenging heroic instances. They're the only place that AoE threat is even an issue, any raid is going to have Rogues for Tricks of the Trade which paired with Fan of Knives is a simple solution to any AoE aggro issues. Just some food for thought.