He'd be destroyed for sure, but he'd do a lot of damage as he goes.
If he feels backed into a corner, why wouldn't he just take as many people with him as possible?
And how would that work out exactly? What would his party do if he tried to pack up and leave? What would his military do? He has their support because he's an important figurehead (by virtue of his bloodline alone) and acts within the interests of those holding him in power.
If KJU tried to "go rogue" (especially if it meant betraying his own country) he'd be dead within a heartbeat. Accidents happen.
I'm curious... what would prevent him from something like plastic surgery and fleeing before things get too bad?
I'm just thinking that if I was a remotely rational dictator in his position, that's what I'd do right before 'showing them' and sending off a nuke or two that would probably/possibly lead to the obliteration of my own people.