The Koreas are moving ahead
This article is worth your time.
"What we are witnessing in the Korean Peninsula is the beginning of the potential transformation of the geopolitics of the region. Interconnectedness between the Koreas would reduce regional tensions. A peace agreement including both, as per the Panmunjom Declaration, would change the psychology of this remaining hotspot of Cold War hostility."
This is correct but not sufficient. What we are seeing is the beginning of the new world order. While the Koreas will continue to pursue normalization of relations, Trump is playing a bigger game. Trump is likely attempting to tame the NorKs and lay the outline of the foundation for the new world order.
North Korea will be the light lifting in this infrastructural undertaking. It is the Middle East, Russia, and China which will prove to be the heavy lift. Beyond that lies the vast potential of Africa, a huge continent with nearly as much potential as Asia had in 1945. Back then we thought the problems in Asia were incurable that the poverty too severe to solve. Today Asia has mostly solved abject poverty.
The new world order Trump is outlining now will firstly address the remaining problems in Asia including Russia and eventually address the problems in Africa.
The direction of America will change as will the direction the world is taking; a new world order is by definition a change in direction.