[asdfman123]

Sure, but the future (unless we somehow stop it) is all the weapons of war becoming completely autonomous. Maybe little plastic drones won't help, but autonomous tanks, ships, missile launchers... you name it, and at some point they will be far more effective at killing than a machine with a human in it.

[missosoup]

Of course, that's already the case now for a lot of weapons. It doesn't fundamentally change the equation of war though. It's always been about machinery and the logistics to support it. There are very few exceptions, such as fighter pilots, where the actual humans are meaningfully expensive.

Now instead of having humans inside machines fighting other humans inside machines, it'll mostly be machines fighting machines. And yes, they'll be devastatingly effective against just humans but that's already the case with non-autonomous machines.

Autonomous weapons are a step on the existing tech advancement = force multiplier curve, I don't think they're fundamentally doctrine-changing. Like someone else commented here before, the actual game changer weapons will probably be biological. Unlike autonomous drones/tanks/whatever, advanced biological weapons will soon become available to just about any two bit state actor. Very little thought has been given towards defending against such attacks.