I'm convinced that we will.
The one bit that becomes tricky is when you arm them. Once you arm a UAV or a robot of some sort, and you can't get communications with it.... For example if you have a submarine, and it's out and it sees what it needs to see, the people on board can make the decisions about whether or not they are going to use force. If you don't have a connection to the robot you can't do the same thing, unless you give it specific orders to fire at certain times under certain conditions.
For surveillance and for communications, robots are brilliant. If you start talking about armed robotics there is a limiting factor, which is that the decision-maker is potentially thousands of miles away.