That is sort of why I figure a Scenario fits the bill a bit better than a Raid or Dungeon. At least, better than a traditional model raid or dungeon.
Also recall that just about every class has the option to spec into more CC/Snare stuff, even healers to most extents. So at that point it would also be a test of who can do their job, and sort of an off-role (snare/CC/contribute more damage/stun/kite), and avoid mechanics at the same time.
Think of how many rogues can do amazing DPS. Now think of how many can do that AND still stunlock a mob and avoid damage at the same time?
How many Resto Druids are capable of shifting to Bear and Stunning a mob and shifting back without having the healing slip even a little?
Burn Phase Chimaeron says hello.ie 10 high ranged DPS. Just bounce agro around and kite. 0 Dmg received.
Meteor + World in Flames on Phase 3 Heroic Ragnaros says hello.
It's been done, it is still a challenge, and one that does demonstrate a high degree of skill. If the group can run with less healers because they are good, awesome. The composition of the group is already a part of the challenge to some degree.
I'm a Resto Druid and I want Riptide. It's a very very good healing mechanic.WoW is still holding my attention. Pally Tank has been though LFR a few times, and gotta get my guild to do a 10 man normal to let me try that before I try Pugging it. My Shaman healer is @60, and all I can say is. I WANT RIPTIDE!