I hold that all notions of divine destruction concern the destruction of that which is contrary to the divine will.
The narrow way is the way of self-denial and love. The wide way is the way self-centerdness and inordinate self-love.
Our real self is to live into the image we bear, denying the false self that asserts itself as superior to the divine will. That false self (our old man) will be destroyed. God will destroy all that is not of God and all that is contrary to the divine intention (sin and evil).
God will not destroy the image God creates, but few truly deny themselves and live into the image, thus avoiding the destruction of the illusory self in the age to come.
If we deny self and take up our cross, the false self is already dead- dead to sin; alive to God. Even I have questions, but the idea that God destroys the vast amount of those created in the image would be a much harder notion for me to accept as fitting for God.
"I can say with confidence that if the things whose loss you are bemoaning were really yours, you could never have lost them.” ~Boethius, waiting to be executed, from The Consolation of Philosophy ~Chad Rhoads