It WILL happen unfortunately. Electromagnetic Pulse Bombs are already a fact and, if set off, could render all electronics useless, very scary thought. Imagine being at work when suddenly you hear an explosion and then everything goes out, no lights, no computer, no phones, no modern cars, no nothing. It would make getting home a whole new adventure and you'd be trying to the get there wondering the whole time if your family is okay, because they couldn't tell you except by letter. Very scary to me.
That would make a good story.