Ive wondered the same thing,
I think in pvp it will be a 50/50 (more of a 'preference' on what team you like to play) No dispell succkz =l but trinkets/bubbles can make up for fear. but who knows what new PVP gear to help you will in CATA.

tho for PVE if you lost 1 passive healer seems like you would need to get a full time healer or another class that can off heal (shammy/spriest) to make up for it unless you have the content significantly outgeared.
I have thought about mixin my team up something similar to Ualaas post for PVE but I don't think it would be fun in pvp