The return of the battleship

Many have speculated that naval warfare is a thing of the past, but the technology previewed by Popular Science and demonstrated here show promise of a new weapon that can make a destroyer like a cruise missile machine gun. A few problems need to be solved, but the potential for rail gun toting destroyers may extend the Navy's reach 200 miles inland. At that range it's hard to aim artillery, but once we have the electronic guidance that can survive the 45,000 G's of force as the gun fires the cruise missile will be effectively obsolete.
Some of the other technical issues are how to deal with the great forces involved, how to prevent the rails from welding, pitting or melting, how to cool the system, etc. but in the end it may turn out the be a piece of the future of naval warfare.