I don't know if it was just a rumour but I'm failry sure I read somewhere on the main EU boards that Naxxramas was going to be updated either with WotLK or in a content patch after WotLK was released. Whether or not they change the ardent dawn to a differnt faction or if they keep it as it is now I couldn't say. But I know of several guilds who do periodic Strat/Scholo runs in the expectation of needing that rep in the future.