1) When a permanent peace treaty is finally signed. it must contain a provision that no development of any kind be allowed in the DMZ. There must be no exceptions, including for national defense. because if one is made, first a factory for manufacturing ball bearings would be built, because ball bearings are used in weapons systems. Then it would be a factory even more removed from defense and apartments for the factory workers. Eventually the DMZ would be a distant memory.
The Potemkin village on the north side of Panmunjom would need to be leveled.
All future highways and railways crossing the DMZ would need to be built in tunnels. When existing roads and railways need major repair, they will be eliminated, with the new ones built in tunnels.
2) The goal should be that zero human casualties occur during mine removal operations. Animal casualties would be minimized. The only way to do this would be to create a family of remote-controlled vehicles: a drone to capture video, a drone flying a few inches above the ground to detect metal, a wheeled vehicle to precisely locate and dig a mine out of the ground (the most complex vehicle, by far), a wheeled vehicle to slowly transport mines to a large pit on the edge of the DMZ where they would be destroyed, a wheeled vehicle to recover vehicles damaged by explosions or inoperative due to equipment failure, and so on. The engineering would be nontrivial, but it could be done. Sure, some mines would need to destroyed in place and some accidents would occur resulting in destroyed vehicles, but these would be the exception. Then that same technology could be used in Vietnam. the Balkans, and other parts of the world where mines are tragically prevalent.
3) People in east and southeast Asia have very different ideas regarding animals and their uses. Cantonese "will eat anything," especially endangered species, and an epidemic of poaching is sweeping the world:
- A Chinese man in Guangdong took a dolphin home from the beach, most likely intending to eat it.
- Rhinos around the world are rapidly approaching extinction, with rhino horns even being stolen from museums. Vietnam is a hub for rhino horn trade.
- Pangolins are the most illegally traded animal in the world and are considered a delicacy in China, Vietnam, and other parts of southeast Asia.
- Dolphins are killed in droves in Japan's Taiji dolphin hunt.
- There is a huge demand for donkey skins in China. They are becoming scarce in places such as Africa, with zebras being the next to go because they are close cousins of donkeys. China's response was to decrease the tax on them.
- And so on.
A DMZ nature preserve would quickly become a poaching zone where animals were hunted to serve as meals for Asian businessmen. A dedicated force of military-style rangers would be needed as soon as the mines began being removed.
4) A coast-to-coast hiking trail could be built, with it being unique in the world. This would help to ensure general acceptance of the DMZ remaining undeveloped forever. Scientists would map the route to allow for animal crossings to remain undisturbed, with certain areas being forbidden for humans. The hills bordering the DMZ would be taken under consideration for addition to the nature preserve.
5) The tidal flats in the Yellow Sea to the west of the Korean peninsula are a bird paradise and would need to be preserved along with the DMZ. Soon after a peace treaty was signed, business interests would destroy this treasure which is currently preventing the extinction of several once plentiful species of migratory birds.
North Korea misunderstands the presence of US forces in South Korea. As long as the DPRK presents a threat to South Korea, Japan, and other countries, the US will maintain its current military posture. But after a permanent peace treaty was signed, libertarians, pacifists, and the Tea Party would clamor for the troops to come home to save money. And given how much China hates the presence of US troops so close to its border, one would think it would pressure the DPRK to sign a serious peace treaty.