How does this type of aircraft shift the balance of power? It doesn't appear to do anything "better" than a manned aircraft aside from not having a pilot to lose onboard.
The only consequences I can think of are that the cost for the military is potentially decreased and that advocating war gets easier.
The first one is a maybe. I’m willing to bet that you still need a lot of people to make those things fly, they are also potentially more complicated machines and I’m not sure how the cost of pilots (and replacing them if one is killed) figures into this.
The second one seems significant to me. It seems that drones already make it pretty sure you are nowhere safe if the US don’t like you – even if you are a relatively low priority. Presidents (especially Obama) have become extremely willing to use them for just about anything.