The bottom-line seems to be there's a huge range of plausible outcomes, from a relatively contained, short war to multiple WMD strikes on cities (Seoul, Tokyo,

The bottom-line seems to be there's a huge range of plausible outcomes, from a relatively contained, short war to multiple WMD strikes on cities (Seoul, Tokyo, NYC, etc..) with prolonged fighting for months (years?) to finally defeat all DPRK forces. And this is why the situation persists. No sane person will risk the consequences of "the war is not going as well as we hoped it would"