Whether or not the Navy goes ahead with it depends highly on the costs of modifying the Zumwalt-class' guns to fire the new shells. Both the ammo loading system and the barrel were designed around LRLAP. Excalibur isn't exactly a drop-in replacement, then, and estimates have a retrofit costing upward of $250 million. Still, that's far less expensive than loading the three destroyers with their originally intended ammo.

About the only major risk comes from that range limitation. The vessel would have to get considerably closer to the shore to hit targets deep inland, increasing its exposure to anti-ship missiles and other coastal defenses that might otherwise be too far away. Of course, that's where the stealth comes into play. The ship will ideally go unnoticed until it's within firing range, and might not be spotted until it's already headed back out to sea.