We have some shades of that happening already, but I imagine a future where instead of sending young people to die,warring nations wreck each others economies remotely... which again isn't too far from current day.
While there'd still be casualties it wouldn't be nearly as barbaric as current wars, more developed nations would finally have as much skin in the game as disadvantaged ones, etc.
The way I see it, the best way to discourage war is to make it unprofitable. If war just becomes directly hurting each other's ability to make money I could see war, or erm excuse me armed conflicts, getting a lot more unattractive.
