It was never a balance between light and dark. The theory that Lucas put forward was that the dark side of the force was a corruption on the force
When the Sith were destroy the dark side was no longer corrupting the light side so the force was balanced.
Remember that the prophesy was a Jedi based prophesy. Just like the Sith in the EU had a prophesy about one perfect being that would embody the dark side. In the Star Wars movie universe Palpatine was a pure embodiment of dark side power.
A little more on the Prophecy.
http://starwars.wikia.com/wiki/Chosen_One
Quote:
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he prophecy of the Chosen One was an ancient Jedi legend that foretold the coming of a being who would restore balance to the Force.[2] The idea of balance of the Force, a central tenet of the Jedi Order, refers to the ideal state in which the Force exists in nature, i.e. as the light side. The presence of the dark side corrupts and destroys this natural balance,[3] and the Jedi viewed it as their duty to restore it.
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And before anyone else can do it
