Based on the Timeline's comments, I gathered that there is a finite amount of energy in existence that powers or allows worlds to exist.
Nalawi is apparently running low on such energy, and the goddesses, being what they are, are now a drain on the world. In order to preserve the world itself for a longer period of time, the goddesses must be removed from the equation. Once they are destroyed, the power they hold will flow back to the world. The Gifts of the Nalawi will not return, but world itself will not burn out prematurely.
That is why simply moving the goddess off-world will not help the situation. The problem itself is what they are.
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Nalawi is apparently running low on such energy, and the goddesses, being what they are, are now a drain on the world. In order to preserve the world itself for a longer period of time, the goddesses must be removed from the equation. Once they are destroyed, the power they hold will flow back to the world. The Gifts of the Nalawi will not return, but world itself will not burn out prematurely.
That is why simply moving the goddess off-world will not help the situation. The problem itself is what they are.