First, I do not believe NK has the capability of a large scale EMP attack.
Secondly, I believe your listed scenario of the effects of a large scale EMP attack is greatly over exaggerated. Will, there be problems, yes. But I do not see the doomsday level of problems as you indicate.
Thus, the grid needs to be updated to avoid potential problems, even though I do not see the doomsday level as some would like to promote.
Also, don’t forget humans have a great ability to adapt and survive should your doomsday scenario come to pass.
Hope that helps.
Can we agree that the US electronic infrastructure must be protected?
ONE
ONE weapon.
And yes, within 18 months North Korea will be able to do that - and if North Korea sells it's technology to other rogue States or Terrorist Groups the act becomes a statistical certainty.