The Horde and the Alliance will defeat Garrosh at the end of this Xpack.
Its a group of Horde rebels actually. This is kinda moot though.
Story issue I forsee:
It would be almost a complete joke story wise if, Garrosh is defeated and the Alliance hands the horde over to "blank" and leaves. That does not make sense, that is illogical and that is poor story telling.
The Alliance who had just suffered 2 of its kingdoms decimated, several of its territories destroyed, countless killed.... will blindly allow the rebels of the horde to simply take over no questions asked? Especially if Thrall the one who put Garrosh in charge in the first place is the one returned? I find it easier to believe in an occupational story line rather than..... ok bye
Idea: Org should be split into 2 zones. An alliance "friendly zone" (alliance players will still be attacked if they go to this side by guards, even alliance guards) and the other half should be the horde rebel controlled zone. The alliance Military Npcs will be flagged as Unfriendly to everyone. Org should be separated down the middle with a gate. You will still be able to travel through both sides of the city, but on the "alliance side" npcs will point weapons in your direction (they will not shoot for obvious reasons).... and all u wanted to do was use the bank.
Due to game mechanics alliance players will be killed by all guards, lore reason. Its a delicate situation now. Alliance adventurers who risk the delicate "peace" will be taken out.
Also this would not be a permanent scenario. over time it would eventually become 100% horde again when a true mutual trust can be obtained.
An idea for how this ends, Sylvanas and Lor'themar will likly not have had a bulk of their troops in org under Garrosh's control. Saurfang also has a force in northrend still. They could come back and forcibly remove the alliance presence leading to a continuing lore tension that can continue pvp plot points within the next expansion
New quests, story lines, and characters can emerge from this. This can easily phase out later in the xpack