Considering BFA exists, this plot is imo too spread thinFor me this is much too condensed. We need a good topic for future expansions after all.
Suggestion:
10.0: Comeback to a changed world with revamp of Northern Kalimdor plus Lordaeron. Seamles integration of Draeinei and Blood Elven territory, etc. Rebuilding of the new Capitals for Night Elves and Forsaken in focus, but main action is around the Dragon Islands. Groundwork for new lore, rebuiliding for factions, races, etc, hints of big bads. Races like Ogres and Fulborgs. Dragonsworn Class. Etc.
10.1: Evil Dragonflight make their moves. A zone gets infested with Void(Twilight Dragonflight). Another has its timeline broken(Infinite Dragonflight).
10.2: Odyn, always wary of the Dragon Flights, makes his move, returning to Ulduar to take controle over Azeroth. Armies of Titanforged, Val'kyr and more threaten all who oppose, as he tries to reach a special Titan facility surrounded by a new zone.
10.3: Galak'rond is awakened and we battle him and his forces around the final zone and in the last zone.
10.3.5: Yrel's forces arrive to promise us help against the other cosmic forces. At first the Alliance welcomes them openly despite the Horde's warnings, but then ...
11:0-11.3: We follow Yrel's forces to the planet of K'aresh, trying to stop them, as they plan to shift the balance of the cosmic forces in favor of the light. We meet Xal'atath again, who offers to help us in our struggle. Meet exotic places. Maybe visit a place re-/de-formed by the Light. Maybe return to AU Draenor to save survivors/attack their base ... A special feature could be Light or Void customisations for all races.
12:0-12:3: We go to Kezan, where the Goblin Cartels fight amongst themselves for new tech from K'aresh, trade opportunities with the Etherals, etc. A giant underground zone, a new neutral hub as Undermine, Troll Ruins, Old God Temples ... Tinkers would be the new class.
There is a lot of lore Blizz could use and even proberly connect with cosmic stuff.