Doesn't matter.
Lore doesn't follow in-game-factions-for-players.
If an organization/group/sub-faction has to be dismembered or just simply forgotten due to content upgrades, it is just in game, not in Lore.
The KotEB are a class-oriented organization that got a HUGE highlight because of the new class released in WotLK.
In truth, they're nothing more (or wait, way weaker) than what the Kirin Tor is for Mages, or Cenarion Circle for Druids.