^Oh my, we must be experiencing the fulfillment of this astonishingly accurate prophesy! Basically, the "prophet" said that a major country, at some undetermined time, will experience a breakdown of society as they know it. The Lord must be speaking here...how could any human posess such exclusive knowledge? And on top of it all a cruel leader will come to power? Oh wonder of wonders, the Lord hath spoken.
If you read the rest of Isaiah 19, you will see that Egypt then converts to ancient Judaism, complete with animal and grain sacrifices, and comes under the rule of the Kingdom of Judah. Seems old Izzy (and, apparently, his Lord) had a bit of an agenda when making this prediction.