Let's stop and think this through for a minute.
- In the beginning of Azeroth, there were the Elementals and the Elemental Lords.
- The Void sent the Old Gods to conquer Azeroth. The Elementals fought back, but ultimately lost and became enslaved. The Titans arrived and won the day.
- Then the Protodragons evolved from the Elementals.
- Some Protodragons were turned into Dragon Aspects by the Titans using Order magic, while some went deeper into their Elemental ancestry and became Primal Incarnates.
- Two sides of the same coin, both Elemental in nature but one infused with Order magic, and the other even more Elemental magic.
- Both sides were lured by the Void. Neltharion struck a pact with it, and it seems like Iridikron might've as well.
- Both were engaged in a war, and ultimately the Dragon Aspects came out on top. Essentially, two different philosophies clashed over the right to rule and protect the world they shared: the Elemental magic which had always covered the planet, and the Order magic which had always resided inside with the slumbering Titan.
Right? Okay.
What's happening right now is essentially round 2 of that war. Iridikron is pursuing his endgame, whatever it may be, and Alex is pursuing hers (making sure the Dragon Aspects are empowered once more, and able to fulfill their duty to protect Azeroth).
Then Thrall appears on the cover of BlizzCon 2023. The one guy who's been heavily involved with both the Elementals and the Dragons. The mortal who, in a way, represents both of these forces. He literally was the Earth-warder for a while.
At this point it feels very likely the next expansion will involve some kind of war over Azeroth, which would include Dragons, Elementals, Old Gods and a world revamp.
Theory
War breaks out all over Azeroth, in what is essentially the Hour of Twilight. The Old World is literally torn asunder.
In a cinematic that invokes the spirit of the old Cataclysm cinematic, but with Thrall as the narrator, we see elemental forces clashing, Old God minions lurking in the shadows and deep corners of the earth, and ultimately, Thrall riding a dragon into combat.
Metzen's voice is booming, just as it did when he voiced Deathwing, about the impending dangers and terrible forces now waging war for dominance.
Lands are destroyed and restored, cities rise and fall.
Ultimately the logo appears: World of Warcraft: WORLDBREAKER / AZEROTH / HOUR OF TWILIGHT / TITAN or something like that.
Then, because 11.0 is the final expansion in the "Void" trilogy, after Cataclysm and Dragonflight before it, we get a follow-up to MoP in 12.0 with a thrilling expansion that takes us across the world to the mystical continent of AVALOREN.
Vanilla
TBC -> WoD -> Legion
WotLK -> BfA -> SL
Cata -> DF -> 11.0
MoP - 12.0 -> 13.0