I'm very much a believer in the fact that such underwater vehicles will reshape naval warfare tremendously. I see the purpose of a ship is to bring weapon platforms to bear where desired. The major complication is keeping the ship maintained so that it can get where it needs to go and sustained once it gets there so that it can keep fighting.
That too is the problem with unmanned naval craft. How do you maintain them and control them without an onboard crew and, if they are reusable, how do you sustain them? That is not an insurmountable problem. Once solved, it will change the face of naval warfare. How many autonomous or semi-autonomous weapon system can you deploy for the cost of one aircraft carrier? And will you even need aircraft carriers once a suite of unmanned aircraft and weapon systems become viable?
I'm starting to wonder as to whether or not the money for a few of the upcoming frigates and F35s wouldn't be better diverted to the development and acquisition of cheaper and more plentiful unmanned systems.