I've always thought the 'fading' of the Elves in Middle-earth was connected to their inherent difference from the land itself. They were immortal creatures living in a mortal world, and eventually had to make way for the mortal Men who were its masters.
It seems to be a mirror effect of that which the Blessed Realm would have on mortals, as explained to the Númenóreans by the Eldar:
Quote:
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For it is not the land of Manwë that makes its people deathless, but the Deathless that dwell therein have hallowed the land; and there you would but wither and grow weary the sooner, as moths in a light too stong and steadfast.
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Silm Akallabêth