In line with what Norm just said I'd like to add that one reason to train with traditional, though impractical, weapons is that they help to build martial arts attributes. In San Miguel Eskrima, the FMA that I study, there are a number of weapons studied to that end. For example, the ananangkil is a heavy two-handed short staff designed to build courage and the ability to "stand in" against a heavy weapon; the bankaw (spear) helps show the student how to combine both shoulders on a long lever and generate power from the legs and waist; the latigo (bull whip) helps to build focus, concentrate energy towards one point, and build relaxed whole-body power; the throwing knife helps to build focus and concentration.
I suspect that archery can serve a similar purpose (as could rifle marksmanship, etc.). Besides, you might just have to defend yourself while out deer hunting one day.
Best,
Steve Lamade