One Korea, Two Systems

Maybe this is a useful template for Korea...One Korea, two systems, and open the border and enable kinship ties to be re-established, and let controlled trade and some fighting do the rest. It is hard to imagine it happening, but the only other thing imaginable is war, which will reduce both 'brothers' and possibly the world, to the stone age.
I'd think the annual April War Games of the US on the 38th parallel North border aren't helpful.
The DPRK does have nuclear weapons and the capacity to project them, every knows that but the US won't admit it. The DPRK won't use them. Everyone knows that.
I could imagine the DPRK going along the lines of the China Model for massive progress and industrialisation, and I'm sure the offer of advice is there from China, but China doesn't interfere, nor will it betray the North.
With DPRK on the road to massive industrialisation and a freed-up capitalist economy with a solid communist party core, it could do very well very quickly and thus redress the poverty in the North.  With this achieved, the North could quickly rise to be an economic 'brother' state of the South, and this would enable massive trade and consolidation of a 'One Korea' with two differing systems.