As I said in my post, I think that they would probably prolong the life of all of Sauron's creations, but would "freeze" Mordor as it was when Sauron recovered the Rings, as Nenya did to Lothlorien. Unless Sauron could completely change their purpose, I don't think they would accelerate anything, especially destruction, since that was what the Elves wanted to prevent when they created the Rings.
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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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