It likely will not get any better in North Korea. Kim Jung Il was an autocrat, but he has not been as politically active in 5 years. The problem, of course, is that North Korea is as near to a black hole as there can be.
THe theory of his sons becoming his predecessors, though, has always been spurious. One of them spent significant time in Europe and is considered tainted by Western ideology, and the other had the closest thing to a national scandal within the last few years -- I don't know the details of either, but I remember reading about it a couple years ago.