> I actually wonder if this will bring back something like battleships: a 6” gun firing off drones in a 50-100km range would likely be able to penetrate modern point defense and hit critical systems — like radars, point defense, or weapons. At least, as a swarm from a broadside.
Battleships have disappeared for several reasons, but the biggest one is that it's an incredibly expensive way (in money and manpower) to launch those 6" (or even much bigger) shells. Changing the value of the shell doesn't change the fact that it's still incredibly expensive.
I think we'll be much more likely to see these launched in swarms from other aircraft - the Air Force is already exploring what they refer to as Arsenal Planes, which are basically cargo planes with the ability to launch or drop tons (literally) of long range munitions. These aircraft would remain hundreds of miles from contested airspace and still be able to bring hell down on a target.
Something like the Switchblade 600, launched by the dozens and controlled en-masse by either in-craft or remote pilots would be the modern version of launching these from the Mighty Mo's main cannon.