I think that all the Elves save for a few of the deeply entrenched Silvan Elves eventually left Middle-earth. Even then, I think that all the non-Man races eventually left or died out. Men have this habit of encroaching upon others' lands, and I think that is what eventually happened in Middle-earth. The Elves either died out, sailed West, or "became a rustic folk of dell and meadow..." as Galadriel said.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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