Wars happen due to material and ideological differences. If country A engages country B in a robot war and all the robots die, the humans and the differences will remain.
You could call this a good thing or a bad thing, but I'm not smart enough to figure out which side is more likely to be true.
My point was that unless people change, the causes of war will remain.
“No fate but what we make.” -Terminator 2: Judgement Day