Yes, I agree. I added a few more paragraphs to the end of my previous comment while you were typing this one: basically i concur, it is at least possible that a powerful enough CME would lead to the end of the world as we know it, with billions likely dying within a decade as civilization as we know it rather abruptly ending would cause a shock to thw current geo socio economic paradigm so severe that basically pure chaos would ensue pretty quickly.

But also... there is currently no known way to predict the possibility of this happening. We just know it is possible.

EDIT Even people that live off the land would generally have it very tough. No more fertilizer because the economy has collapsed means you better have been doing old school nitrate fixing crop rotation, otherwise the soil will probably not be good enough to continue without more fertilizer.

You fall into that category? Great! Ready for bands of angry violent hungry people with guns who in all likelihood will eventually figure out you have food? Good luck!