There's no need to exterminate anything. When you have robotic infantry deployed at theater scale, a largely non-lethal peacekeeping approach could be taken with relative ease.

I'd argue robotic infantry would be a massive leap towards improving the security and humanitarian situations in some of the world's most terrible places.

Unlike long-term deployment of human soldiers, political will wouldn't really factor in to robotic deployments. That would translate to less genocide and suffering in the world.