A bit of an unrealistic fantasy, I think. The world is not going to suddenly revert to a wild west town because a lot of people die. In situations like that, more people work to restore order than do attempt to take advantage of the chaos...the only difference is, it takes a bit of time for things to calm down to the point that that restoration of order is possible.
So even if 50% of the population died off over the course of a few weeks (a liberal estimate, I believe), I think that society would begin to return to normal function within a few months. By 25 years later complete normalcy would be achieved.
Would there be food shortages, looting, etc? Sure, but survivalists tend to severely underestimate the desire of people to live in an ordered society. Plus, modern technology would not magically disappear so it's not like we'd end up living in some kind of pre-1800s subsistence farming paradise...once order is restored infrastructure would be as well.