The night elves and their Barbie army have been so completely useless for so long that I am actually kind of annoyed that they should show up now, instead of being excited (as someone who liked them once upon a time).
The Horde losing a few familiar NPCs is supposed to be on par with the Alliance having lost entire cities. I see.
As with most of the Post-WOTLK Alliance/Horde lore, i'm not really buying it. Still, it's a good time to be a Horde player (at heart that is; i'm Alliance at heart, Horde as a player); what with being able to dump all your MoP/Pre-MoP sins onto big bad Garrosh and his big bad followers. The 'real'/Player Horde (these so-called Rebels) suffer no real 'defeat' at all during this raid; more than can be said for the 'real'/Player Alliance prior to it.
Not only that, but a Mag'har/Dragonmaw hybrid would be very interesting indeed; not least due to the potential lore connotations it might have. Imagine for example, the Dragonmaw and Mag'har somehow uniting against the green-skinned Orcs of Durotar; the Garrosh heir/heirs seeking to avenge their father.