Well yeah, in that case I would imagine Japan realigning with China, which then encircles Korea. I doubt the DPRK wants to fight a civil war given how much suffering has already befallen the Korean people, it would be very difficult to justify even more suffering. More than likely SK will get pressured to push the last vestiges of the US military out in order to participate fully in regional cooperation, and that's the condition DPRK is looking for to begin pursuing peaceful reunification.