Originally Posted by
Eapoe
No. Keep in mind, the hate and prejudice is still there between factions. From a lore perspective, it still wouldn't make sense. Keep in mind, even with a million subs, where the lore is concerned there aren't a million people fighting the Legion right now. It's you, Khadgar, Illidan, and a few others. Also where the lore is concerned, Horde and Alliance have worked together only once on a grand scale, and the assault on Broken Shore failed miserably. From what 1 side experienced, it renewed that hate and prejudice completely. Vanilla, BC, Wrath, Cata, MoP, WoD, and now in Legion each faction is working separately. There are a handful of NPC's that do not have the hate, such as Saurfang in Wrath, who suggested if the Horde saves Bolvar it might help the factions, but what happens shortly after? The 2 factions try shooting each other out of the sky getting to the peak of ICC.
We also have factions where all races coexist side by side. Those like the Ebon BLade, the Kirin Tor, and the Silver Hand. These are a handful of characters in the grand scheme of things, and even those in those factions have shown they still harbor hatred and grudges.
Anduin and Thrall are the only faction leaders that has ever shown any kind of idea of wanting peace. Others have merely cooperated and kept an uneasy truce thru the years. Even Varian stated the only reason he didn't be attack the Horde at the end of MoP was because of what the Horde did. They have put aside differences at times as they raced towards the greater threat, but even then they have still attacked each other: previous example of ICC, the faction champion fight at TotGC, fighting for resources at Wintergrasp/Tol Barad/Ashran, and all the countless outposts.