Games and sports are about entertainment. War and conflicts are relatable to explain and inspire but not a necessity. Even winning and losing as the main concepts can be replaced by success and failure which are not exclusive to war. You can program and describe chess (a literal war game) as just with logic, the war lingo is just to make it relatable and attractive. If war and conflicts disappear (that’s not gonna happen soon) other forms of games and sports will appear with more relatable aspects.