No one knows what an EMP blast would really do. It might not be as effective as people think. It might be spotty at best. And even if it was bad, our nuke subs would launch and turn North Korea into a cinder. We could launch EMPs on other nations—like Iran, China, etc... The use of these—could go all out. Lets hope all this talk is just hot air—BUT I fear someday someone will be tempted to use one of these things.
Like Iran? We may soon see if they truly intend to use them. My bet is the Mullah's are crazy and sufficiently hate filled to do such a thing.