I'm getting really angry reading all the replies in this thread, people are looking at the PVE and PVP content of today and says how much this will ruin their class. While it's pretty darn obvious that with this Blizzard will balance around this and therefor not make any encounter where you have to spam dispel everyone, in PVP it will allow them to get rid if RNG dispell resistance talents due to healers not wanting to spam dispel themselves due to the high mana cost. This leads to you actually being able to dispell when you absolutely want to get rid of a debuff/buff instead of relying on RNG.