And new technology is coming. The possibilities are endless. It is even possible to strike terror in the heart without harming a soul or damaging anything. Sometimes a simple turn of phrase is all that is necessary. We know where you live.
Guns are by no means obsolete.
Projectile weapons in general will be with us for a very long time for a very simple reason. They still work. Even in this age of wonder, when cities can be vaporized in an instant and a single vial of the right virus could conceivably kill us all, the prehistoric sling still has a noticeable effect on politics in the Middle East. Even clubs still have a prominent role in deciding who decides what happens next. I myself once escaped by the breadth of a gnat's eyelash succumbing to a pointed stick in the hands of a psycho.