I've been pondering if such an idea would be practical. It is entirely possible to create a ship that can be controlled by computer as it is a plane or automobile, but with a ship it is more complicated considering the amount and types of systems. I just would like to hear others' personal opinions on this.
Depends on the size. A 100 ton UxV launched from a mothership is probably viable on one level, while a 1000 ton OPV isn't. The crew on a warship are there to make sure the ship can sail into harm's way if need be (ie the crew is there to keep things running).