Normal modes of dungeons are tuned way lower than even heroics. The heroics are much easier than they were in Cata and you might even be able to get away with this in a heroic 5 man. Having said that, I wouldn't do this to a random healer. I've been there and there is nothing I hate more than someone who expects me as a healer to work twice as hard to make something work so they can skip a queue faster or "have fun" at my expense.
If you want to see why this would be my opinion on this, take a good look through the blood builds. There is a lot of damage reduction and survival that comes only from being blood. If you had problems blood tanking, it was because it was new to you.
Edited, Oct 31st 2012 3:27pm by sifuedition