This really, similar deal for DPS-warriors, the "Use intimidating shout"-routine is almost as silly as the "Offtank a mob or two, the healer won't mind!"-nonsense, Blizzard promised actual CC, not "Derp, we'll make your fear approximately5% less likely to pull adds!"-rubbish, and with both their LFD-system and "Bring the player, not the class"-mantra, we'll be needing it.
Assuming the average WoW-player has the common sense to understand you don't need 3 CC-classes to do heroics is pretty naive, they had huge trouble understanding that in BC, so why would they suddenly see the light in Cataclysm?