Sounds cute on paper but it's pretty useless in practice. The only time I see this thing kill is when:
1. Someone's afk (after 5 years of being tickled)
2. Someone's a sneeze away from crumbling into dust
3. Someone's propkilling with one (in which case spawning a new copy would just be a detriment to oneself)
I'd say a better solution would be an upgrade for more ammo (bigger nuisance factor) or more damage per tick (so that they are something to actually be worried about), or, if even possible, better maneuverability (so that you can't just walk in a straight line and treat them like house flies).