We're not wishing for him to die. That blood of his will kill him eventually even if we don't wish for it. That's ultimately his destiny.
And which idiot would lead a country full of swines lang JooDoh and KyeSuk? Even if Yona's nice, I believe she's not that stupid
but even if he doesn't die yona and the others are still separated and stuck in the castle it doesn't seem like it can get worse than that
but it's because he needs yona now that he's dying and if he's alive and healthy, he himself already said that he doesn't need yona and the four dragons, she's the most fitted person to rule in his place plus she also established many connections
we shouldn't wish for soowon's death
because he can lead the country very well and if he died, yona would have no choice but to lead in his place. We wouldn't be able to see the dark dragon and the happy hungry bunch adventures that we live for again FACTS