And sometimes things happen that are completely outside of your control. In a true SURVIVAL situation, it is likely something catastrophic with injuries and in harsh conditions. Being disoriented and isolated for a time, if properly equipped, is merely an unplanned camping experience, as Peter Kummerfeldt describes it.

Even in a catastrophic situation, a little bit of preparation goes a long way. Skill/training/experience is the best thing you can have in such situations. This comes from practicing and using your "survival" gear. As Hikermor says, a reasonably equipped backpacker is well equipped for survival. What most lack is training in the proper skills.