Most od us are pissed about the serie of nerfs we got and even blizzard agrees on the fact that we need a new tool for PvP / arena. They also said they would not like to give away anymore MS debuff soooo What i propose for DS are:

1) knock back (obviously going to interup spell casting ) We r a melee class so people might think it's a bad idea to knock targets away from us :-\, but not if their movement speed is reduced by X% after they fall 8)

2) It could just be an AoE spell interup that also prevents spell casting for 2 sec.