Alright hypothetically speaking and basically because I'm bored at work on a Friday, if blizzard removed one of the pure dps specs and added a tank or healing spec, how would you like to see it shake down?
Hunters
BM - I think would make a decent tanking spec. Give them abilities to keep the pet alive longer and increase threat
Warlocks
Demonology - Should be a tanking spec but unlike hunters and pets, I think they should turn into demons and lose their pet (merge with their pet basically)
Mages
Arcane - Could become a healer and run their mana rollacoster but with heals (certain heals being extremely low mana and others being more efficient with the more mana you have)
Rogues
Sub - Healer, make them have to stealth and unstealth throughout a fight in order to access different abilities. Have abilities more like a medic and use different bandages.
Not that I hate these specs or even want to see the end of pure class, but hypothetically speaking, what would you find interesting.