It isn’t the robots in humanoid form that concern me.
What is truly a concern is small flying drones.
Imagine a small, even hand sized drone with it’s own autonomous control. This drone could contain facial recognition, targeting a particular individual, or it could be programmed to target any human it sees, or any other characteristic. These can be equipped with small explosive charges of a few grams. Fly it against your head and BANG.
Imagine this scenario: A swarm of these drones are released near a target. Some are programmed to blow a hole in the side of a building...let’s say a school. Then the rest are programmed to go through the hole and attack any humans they find inside. It would be like a swarm of angry hornets, only these hornets are armed and are looking specifically to kill people.
All of this is doable today just by combining the necessary and already available technologies.
All that tech is here today.
ALL of it.
And you are right, it’s the airborne robots we have to worry about, they’ll carry C4.
I figure they'd find you initially by homing in on your phone, because they don't need line of sight.