There is simply no place for the battleship. Amphibious assaults have evolved away from massed shore bombardments of WW2 era. Besides, with the speed our forces are capable of moving today, they would be quickly out of the range of battleships parked 1 or 2 miles off shore. The Zumwalt class destroyers will fill the NFS gap. They have 2 6.1” guns that have 50 meter CEP accuracy, range of 59 nautical miles and can fire 10 rounds a minute. The Iowa class 16” guns had a maximum effective range of 23 nautical miles.
They don’t have anything yet. The first one, projected to be delivered in 2014, will spend at least five years as a test platform. Navy initially wanted 32, then 24, then 7 and now a whopping total of three are planned due to the enormous cost. Three whole NFS platforms (assuming the first one or two get all the kinks worked out of them) for $9.3 billion.