At which point modern drones or missiles are smart enough to switch to emissions homing. The modern surface ship has to radiate to coordinate CIWS fire.
First rule of modern warfare: You radiate, you die.
There are many ways to pinpoint the location of virtually anything that floats. All ships has a distinctive magnetic resonant image. Regardless of jamming, chaff, whatever there is no way to hide or shield it. There are satellites that can scan the ocean and pinpoint those specific images. The people who will direct lethal ordnance of various sorts will be sitting behind a computer console in a bunker perhaps half a world away. Many feel the era of surface capital ships is over. It will be very hard for today’s “Battleship Admirals” to accept the realities of today’s ever evolving lethal technology.