There seems to be a balance in that classes which excel on small teams such as warlocks/rogues become less powerful as more players are added to the picture in regards to a "balanced" team.
While there are 5v5 teams that have altered their "balanced" setup to aim towards a warlock/shadow priest focus, this type of setup is heavily caster and many times doesn't contain a warrior.
Couldn't a rogue/druid heavy 5v5 eventually be the setup that overcomes the shadow priest/warlock groups?
The rogues are able to strip off all the DoTs and should be able to dps down a UA warlock (no soul link) quite quickly while keeping the paladin blinded/cycloned even with a PvP trinket and bubble.
Also in regards to rogue survivability, wouldn't it help if you added more PvP gear to your setup? While your rating is good it seems you're wearing level 70 instance blues and suffering by only having 71 resilience and 8000 health.
Ming has a similar spec to yours (18/43/0) but maintains the same attack power while having 365 resilience and almost 11k health.
http://armory.worldofwarcraft.com/#c...s+Blade&n=Ming
Her 3v3 rating is quite impressive too, running a priest/warlock/rogue setup.