Still had to atom bomb the Japanese for them to capitulate. Sometimes defenders ready to fight with stick and stones. At the end of the day, still need to slaughter a bunch of combatants and civilians to extract human cost to prime surrender. Drones may make that more expedient by making the slaughter competely lopsided. But peoples tend not to capitulate until they've suffered severe loss in material and lives. IMO what's more likely are fully automate drones that guns down wedding parties without human operators on winning side developing PTSD.