Looks like Blizzard liked my idea.
Here's the official response.
Sounds like Unholy Blight (since it spreads blood plague around) will finally have a lot of PvP use. =]
If i'm not mistaken, this is going to be in addition to the initial removal of one hot or stack of lifeblooms on the initial plague/scourge strike. Update: Looks like it will be. (in addition)