There's literally nothing there that any tank class or a Rogue doesn't already bring. It's hard to justify that what makes up for not having any kind of raid CD whatsoever (seriously, DKs got one patched in, Enhance got one on top of the one they already had, and Rogues had one patched in) is something that you generally only need one of (stun) or something a ton of people can do (Shadow Priest, Boomkin, and Rogue all have huge damage reductions on fairly short CDs).
Now maybe if Ring of Peace or Zen Meditation could actually be used for anything outside of extremely specific mechanics there might be a use for WW, but as it stands WW's only value is pure DPS numbers, which is a pretty awful place while Rogues exist and melee spots are limited.