But with everyone under his thumb and some men(there will be) even exploiting the situation to oppress other men couldn't it go on either forever or a very very long time.
Any revolt will be crushed, any disloyal orcs destroyed. Sauron in theory could reign over Arda for thousands of years as an immortal god king to his subjects terrible and mighty, the lord of men and the earth.
It would be cruel and nearly a dereliction of duty of the Valar to allow this state to remain unchallenged.
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