Re: "The bad guys will have 1000's of automated sub killers"
"North Korea ain't gonna be automating anything any time soon"
Be that as it may, North Korea has demonstrated its ability to sink ships and submarines.
The problem with high tech anything is that the means to take it down is quite frequently low tech and low cost.
The winning formula for high tech _must_ be low enough cost to allow it to be cheaply deployed, or you have yet more F35s.