Both sides staring at screens, controlling drones fighting each other.. why use physical drones at all? abstract it away and play video game?
In the near future, war might be about who can build faster/better and hit the other economy more effectively, and those who can't produce any more drones, lose.
If you think about, we moved human one-on-one battles to MMA and combat sport, this allowed channeling individual human aggression in a controlled environment. The future war might be not very different, swarm of drones fighting other swarm of drones while others watching on the news, who can build, manage and deploy smarter and more effective drones. If one side economy collapses and their manufacturing collapse, then what is left? they could easily kill the people, but other nations won't allow it, so it will stop at economical defeat.