This is something on my if-only-someday wishlist too, making the naval aspect of the game like the tanks, only better. Add submarines in as well, give the destroyers something to fight, and even add depth charges, skip bombing to naval patrol planes, etc. So much potential there - I'd love for the cruiser, destroyer, even future battleships/etc to all be player controllable in terms of their direction, speed, as well as the guns which we already have. It'd be a huge blast, particularly adding a Silent Service effect to the game with submarines, hunting down CV groups (historically the greatest threat to CVs were subs), and being hunted yourself...
The graphics are sure there, it'd look fantastic. Of course, busy times that they are in this development cycle, it's not reasonable to expect this anytime soon, but if it was built, many would love it I think.