I'd like to be able to say that yes, his death will effect positive change, but I really doubt it.
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No. Watch any documentary of North Korea. The people there are as brainwashed as can be. They literally worship the entire family.
Actually you may see things heat up there as his son is now taking over. He's going to flex his muscles and warn the world he's now in charge and don't take him lightly. So things could be frantic for a while until some diplomacy is reached.