Something has bothered me since the Wrath of the Lich King to Cataclysm class changes/abilities; Disarms went out the window with nearly every Class.
While in that Blanket Silence the Caster effectively cannot do anything. There are currently thirteen Blanket Silence abilities across the board. In addition; Casters must watch out for nine other interrupt abilities. Now on the otherside of the board - Currently only three class/specs currently have Disarm effects (Shadow Priest - Psychic Horror| Warrior - Disarm | Rogue - Dismantle).
That's a ratio of 22:3.
To write it down in cold letters - There are 22 abilities to interrupt or Blanket Silence a caster in game as of now. There are only three abilities to disarm.
Weapon Chains are hardly used anymore. Even in high rated arenas.