If you've seen Book of Eli, he makes good use of a bow in his post-apocalyptic world. It almost makes more sense to have them rather than guns as the main ranged weapons. Even advanced crossbows would be easier to make than guns, it should have been "bow runners" or something.
I'm not saying change the dynamics of the game, I'm just suggesting a bow or crossbow eventually come up in some DLC maybe? You could scatter bolts and arrows all around like they did with the empty syringes after the patch. Put them in the guns category and be done with it.