We already drop quarter of a million dollar bombs to kill single targets. Having a drone which turns into a disposable rocket to hit a single target is hardly unfeasible.

They are still going to optimize everything, something that can fire X number of shots instead of being a one-off rocket will stretch their budget farther, etc.

Right, but that wasn't the point - the point was that thusfar, the appeals to mechanical limitations of drones as weapons of war have been based on very limited thinking.