They said it would be a disaster if Kim Il-sung died, and a disaster if Kim Jong-il died

‌In reality, no major disaster occurred.
But will Kim Jong-un be any different?
As it happens, his successor is his daughter and she is quite young.
Some circles are even raising rumors that there is a son receiving secret successor training,
But unless Kim Jong-un lives a long life and transfers power while training his daughter as his successor,
if he dies suddenly due to illness or an accident, won't the Korean Peninsula open the gates of hell?