If the US starts to care about expenses for foreign military bases, this would be great. Actually, nobody cares. Or maybe Trump cares? Wow, the evil fascist transforms into somebody without any aims for whatever. Given that a non-nuclear NK is not really a choice, your whining about nuclear NK is quite irrelevant. All it means is the continuation of the state of war, the sanctions, and all this. (The only way we can imagine NK getting non-nuclear is through China. And this requires that Chinese power over NK is strong enough, which is not obvious at all - NK has done a lot of things China did not really like. But to get China on board, you have to pay, and the payment is quite clear - denuclearization of South Korea too.) Instead, there are quite reasonable ways to increase the peacefulness of a nuclear NK after a peace treaty and an end of sanctions. There can be a lot of transit from SK to China and Russia. In particular pipelines. Which would generate transit income for NK, You think the South Koreans like to live in a state of war and prefer it to peace?