The positive part is that along the way they will have to solve a number of very tough engineering problems to be able to realistically perform the tasks you outline. For example to my knowledge the efficiency of robotic movement is still far below that of humans, the same goes obviously for image recognition, autonomous planning, energy storage, etc..
I think as long as the US manages to scare the american public into funding those huge military projects, because they need to be protected from someone, be it communists or terrorists, and not actually use the results all that much for military purposes the world at large will be fine and eventually benefit tremendously.
I think as long as the US manages to scare the american public into funding those huge military projects, because they need to be protected from someone, be it communists or terrorists, and not actually use the results all that much for military purposes the world at large will be fine and eventually benefit tremendously.