Darkness is merely the absence of Light.
Is Evil merely the absence of Good?
When God created Light, He said it was Good.
Was He shining the Light on Evil?
Since Satan is a fallen angel, he apparently was not created evil, he became evil. Where did the evil come from? Did evil always exist, jut like God has always existed. Did God create the Evil, by shining a Light on it?
Even when this Old World passes away and God creates a New Heaven and a New Earth, evil will still exist, because it will be where the Demons will exist. Hell.
So evil will never cease to exist, we will just be separated from it in the New Heaven and the New Earth.