Originally Posted by
Trassk
The purpose it serves in the progression of the story, by lore, wrymrest accord is disbanded and the temple ruined/corrupted, including all the dragon shrines inside the temple.
Dalaran now is meant to be moved on from the northrend campaign, and yet if they did that it would mean having to completely revamp northrend to accommodate for dalaran no longer being neutral. They can't just do that given dala is a central hub for lv 80s, so they will likely leave dala in northrend, say its not canon now in the timeline or related to the current story, just ignore it, and believe that dalaran is no longer good with the horde.
also the fact there are so many achievements and even a dungeon linked to dalaran, making the lv80 wrath dalaran suddenly hostile to horde players because of the current story in mists of pandaria would mess up the gameplay for those leveling though more then you can guess.
I personally say this progression of the story is bs, since the horde helped save dalaran's ass along with the alliance against the blue dragonflight, and yet because of Jaina none of that matters.