I’m skeptical. As long as he has the security services in the palm of his hand, he will kill his internal enemies and remain firmly in charge. Note that Kim Il-sung lost an entire army invading South Korea, yet not only remained in power, but handed the throne to his son, Kim Jong-il. And his grandson, Kim Jong-un remains King in all but name.
Their focus on eliminating any potential rivals (somewhat like the Democratic Party in that respect) has so gutted their society, that recovering from a collapse of the system will be much harder.
But such systems are brittle. When they break, they can shatter quickly.