To be honest, I'm more worried about the lack of education we have these days. We seem to take for granted that a certain level of knowledge is unnecessary these days -- because we can just let the factories deal with it. How many people know how to make preserves? How many know how to make beer? How many know how to grow vegetables? How many know how to fillet a fish? It's just basic information that used to be common knowledge in every household -- it's already lost to the majority now. Of course we can relearn it from books, but I often think that together with this explosion of access to knowledge, we're already in a bit of a dark age. I suppose the cause is that most are uninterested. Even me, if I'm honest ;-)
In any scenario where society or technology breaks down enough for these skills to be useful, the majority of the population still won't miss them. Without industrialised fishing and farming (which relies on oil and huge production chains) we don't have nearly enough fish for people to filet or grain for people to make bread (let alone beer). And statically speaking you will be starved before your vegetables are grown.
