system
Given the following post, respond as if you're commenting on Reddit:
human
[Warcraft] How would the events of Warcraft 3 and World of Warcraft differed if Arthas had listened to Medivh and taken his people to Kalimdor?

Basically, what happens if Arthas never falls and the Scourge claims Lordaeron without a war?
gpt
- The Lich King picks a different Champion.  Someone not quite as skillful and driven as Arthas.  Maybe Kel'Thuzad ends up the leader.  Maybe Anub'Arak.  Maybe Garithos gets his mind touched and manipulated down the road to corruption, he's a skilled warrior, and certainly enough of a pompous ass to fall to his own hubris.

- The humans exile themselves *again* after having finally gotten settled after the first two wars.  They're good at this by now, and most of the humans escape unscathed.  The few left behind get gobbled up by the horde, and turned into undead.  

- Quel'Thalas remains behind and attempts to defend the Sunwell, which they can't move.  They fail, and die horribly.  Sylvanus Wind~~rider~~runner still gets brought back as an undead.

- The human forces arrive in Kalimdor, and are manipulated into fighting with the horde and the Night Elves.  Anything they retained in strength from not getting overwhelmed by the scourge, they lose by infighting with the other not-really-our-enemies living folks.

- The scourge rampages over the mainland, makes it to Kalimdor, makes it to the Tree, and Archimonde gets killed by the wisp trap thing, just like what happened in the regular timeline at the end of Warcraft III.

- The events of WCIII Frozen Throne continue more or less unaltered.  Illidan still attempts to destroy the Frozen Throne through a giant magical earthquake, and is still stopped by Malfurion.  

- Only the end changes.  With a Champion who isn't quite as powerful or skilled as Arthas, Illidan emerges victorious at the end of the Frozen Throne campaign, and destroys the Throne, ending the Scourge forever.