EMP is possible.
IMHO, it would be the one attack the enemy could do to us that would actually be beneficial instead of bad. It would take a while (years) to recover from it, but breaking the idiot boxes hold on people would get the job done, I think. I know there are so many other things that would be so difficult I just can’t imagine (hospitals not being able to run, ventolaters, surgeries, vehicles, and a host of things I cant even imagine I am sure,) but the founders did it without all our luxuries and advances, I think we could as well. I would consider it a necessary sacrifice I guess....