Kevin23 asked:
.... does anyone else here think that the DPRK could completely collapse one day in the coming years?
Yes, only if China (PRC) was to dramatically change.

I have only considered what happened in Eastern Europe, with the sudden, incremental collapse of the Warsaw Pact - which started in Hungary and a decision on allowing holidaying East Germans to leave for West Germany. Self-doubt certainly existed within parts of the regimes in power, some independent groups notably the church and the USSR's refusal to support coercion. None of these factors apply in North Korea.

We simply know so little about the internal factors at play in North Korea no-one I venture can predict the future.