That depends on how it happens, unless china collapses or is otherwise paralyzed they will try to get the deal the Soviets demanded when they let the germans unify, no new us bases closer to their territory.
Yep, it did with the 2 germanies, and while east germany was bad it wasn't the dumpster fire of north korea
https://www.marketplace.org/2019/11/05/itemizing-germanys-2-trillion-bill-for-reunification/
There isn't all that much farmland in north kotea, the entire country is only half the size of florida, while there are some minerals again think of that more as a bonus.
For resources, two things
1. A supply of cheap labor... read slave labor
2. An existing labor camp system that would serve as a deniable asset for the chinese, because every time theirs gets exposed it is embarrassing.
To be fair given how the news that he might be dead came from anonymous sources telling the mainstream media, given how badly they have lied over the past few years what reason would anyone have to believe it.