Nothing would make me happier if, as we seem unable to break out of the ludonarrative dissonance of the game's faction based play but constant 'we're getting better now' narrative, it was the Alliance's turn to have the warmongering leader that needs to be put down by the opposing faction and the "real" Alliance as we've now done... at least twice with the Horde. Call it 2.5 times if you connect Garrosh's history rewrite.
Have the Dark Portal open with golden rays of blinding holy light, Yrel and Alt!Xe'ra pouring through to "purify" Azeroth, having Turalyon go right back to golden eyed care-bear staring chandelier simp, and you've got an expansion.