Are there enough fed-up North Koreans in exile to organize an overthrow of Lil' Kim?
There are enough power-hungry folks in NK to off him. Assassinations and sabotage will up the ante, and create opportunities.
Kim's regime, in recent years, has reminded me of what little I know about Chinese court politics -- dragon ladies positioning their offspring as "favored sons," etc. Lots of turmoil boiling just under the surface. I think the Chinese probably have the best understanding of how and where to exploit this -- and I think they will.