I suppose I can see the human race reverting to being barbarians. What is left of them any way. The people of today are not prepared to live like people 150 years ago. Most homes do not have a means for cooking your own food or heating it, not to mention getting water. No fire places or wells. Gas ovens, gas heaters and city water wouldn't exist.
Most people do not have the knowledge or the skill to maintain themselves. Hunting? Most people would go ewww over dressing their own game meat. That is if them shot, trapped any. Only a select few have the ability to farm, even fewer with the ability to farm without machinery. Current trades mean little with out technology. Few of us know anything about the trades of the past like leather goods (foot wear, clothes, etc), carpentry, masonry, etc.
The human race would be in poor shape to do anything. We rely too much on technology and machines to do things for us. Look at natural disasters like Katrina in New Orleans. Pretty pathetic.