Like the light at the end of the tunnel, it's coming. For the past several months there's been a rather conspicuous demon world in the sky, now replaced with with this shining distant star.
So what happened to change that? The defeat of the Burning Legion.
So now Sargaras is imprisoned by the rest of the Titan Pantheon with Illidan serving as his jailer for the foreseeable future; but not before stabbing Azeroth with a huge ass sword and completely destroying the Silithus zone (which is no real loss anyways).
An impressive end to the expansion, but how does this all mean WoW is coming to an end? Well of course it's not ending soon since we have Battle for Azeroth next. But the problem that remains is that we're simply running out of enemies to fight. The Lich King and his undead Scourge defeated, Deathwing and his black dragon flight destroyed, Xavius and his Emerald Nightmare are destroyed, and most of the Old gods and their servants have been defeated. Now Sargaras has been imprisoned, his main generals Archimonde & Kil'jaeden are permanently dead, and the Burning Legion's main source of power (The titan Argus) has been destroyed, rendering the Burning Legion largely irrelevant.
So who's left to fight?
- N'Zoth the last of the old gods, who is possibly rests in the sunken city of Ny'alotha.
- Queen Azshara who made a brief appearance in Legion and is set to make an appearance during Battle for Azeroth.
- The prophet Zul who we only heard about in past expansions but never really seen and is set to appear due to the Zandalari civil war between the followers of Zul and the Zandalari King.
- The Void Lords, who we don't know much about.
So about half of the remaining threats are guaranteed to appear in the coming expansion, and the other half? Who knows! Legion could of very well been two expansions but they instead decided to make it one big expansion. So it's entirely possible that they could finish off the remaining threats during Battle for Azeroth or the expansion that comes after.
But after that? Well there's no known threats left, after that World of Warcraft could legitimately finish up its remaining story arcs and end. Nobody knows the future, we will just have to wait to see.