didn't read the article, but I can imagine if things goes well, in developed cities/states, the robot to human ratio can be anywhere between 3:1 to 1:1. Robots will be indistinguishable from weapons. How can a billion human regulates 3 billion robots, regardless how many safety layers we have.

There are many small countries run by military with probably 1:100 military to civilian ratio, the civilians can do nothing to change it.

Technology is wonderful, I am very optimistic about the technology, but also can't help feeling the same way as Hinton does.