Fun, but does not make much sense as a weapon. You still need a camera with a cross hair or other sights registered to the gun on the drone.
If you have to be close enough to watch both the drone and the targets to make it work, it loses a great deal of effectiveness.
Still, It is a clear direction we are moving toward. Imagine such a drone with good optics. You operate it from a fox hole without exposing yourself. It seeks out the enemy, either to draw fire to expose their position, or to take them out. Every infantry man will want his own personal ground support drone.
Now imagine a coordianted constellatin of them working with a company of infantry. Best of all, they are cheap. For the price of one A-10 Warthog, you get 2,000 drones.
They are just the thing for low level warfare.