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Ardenaso In Metzen's story, peoples relocate to other lands only after apocalyptic, doomsday event.
- The Orcs of Draenor forcibly relocated to Azeroth after the Legion/Warlocks/Shadow Council ruined their homeworld with Fel.
- The Humans of Stormwind relocated to Lordaeron after the Orcish Horde destroyed their kingdom in the First War.
- The Humans of Lordaeron relocated to Theramore after the Undead Scourge and the Legion destroyed their kingdom in the Third War.
- The High Elves relocated to Dalaran, and then Outland, after the Undead Scourge destroyed their kingdom in the Third War.
- The Draenei of Argus relocated to Draenor after the Legion destroyed their homeworld long ago.
As you can see, in Metzen's Story, peoples only relocate when their original homeland is truly, undeniably, and unmistakably lost.
If the High Elves relocate to Feralas, they will do so with the Blood Elves after the Void has finished what Arthas started and completely and finally destroyed Quel'Thalas.
Because that is how Metzen write his stories.
"Oh we just decided one day to relocate to Feralas for literally no reason!" is how Danuser writes his stories.