I agree that PERHAPS cooler heads will prevail, ... but the flip side is that this thing COULD spiral out of control. It depends upon whether N.Korea can muster any major damage against the U.S., S.Korea, and possibly Japan as well.
It is a fact that both China and Russia have been long-time "allies" of the N.Korean Regimes. they know very well what a rogue nutcase nation it has been for over 60 years. Diplomats have openly conceded that it is "surreal" trying to deal with the N.Koreans. they are the worst kind of fanatics.
Anyway. I hope you're right. I hope there can be SOME nonmilitary means of dealing with the N.Korean nuclear threat. But I think time has just about run out on that one.
WW3, as you probably know, is more likely to erupt over Syria, Israel, and Ukraine.