Thasmodious
First Post
They didn't rip anything off.
But they did borrow heavily
Tank
Dps
Healer
v
defender
striker
leader
controller
It's not quite 1-1 and it flowed both ways. WoW borrowed from D&D.
#1 by accident. With 4E WotC is trying to repeat the success of WoW in PnP form.
You must be new to gaming. The concept of "tank" wasn't invented by MMOers, its been around since 1e. In the 1e PHB there is a section about it being ideal to balance a party around the character roles - tank, wizard, healer, skill monkey (not their terminology, but tank has been in use since the 70s).
When 4e has elements that D&D has always had, but that also happen to be elements that WoW borrowed from D&D, that doesn't mean that D&D is now "reborrowing" them from WoW. They were already there. Roles are nothing new, just the terminology is more set and the concept more internalized than before. Your class comparison list is ridiculous, since those are all classes D&D has always had. There has always been a fighter class. Just because WoW has a warrior class doesn't mean D&D somehow copied WoW by having the fighter class its always had in its new edition, nor wizard, cleric, paladin, ranger...
Your reasoning is really, quite incredibly, flawed.