Glad to see North and South Korea making what appear to be earnest efforts to reduce tensions and short-term possibility of war. But let us not forget history: DPRK strategy has long been one of oscillation between good and bad relations with regard to ROK.
It would be extremely strange (by basically any theory of human or political behavior) for Kim to give up a deterrent right after attaining it. Nothing is impossible. But it would be very unexpected — the strangest possible outcome.