I don't think it will come in large numbers. Imho my guess is that it's more to start training a generation of sailors who are familiar with modern-ish destroyers and frigates.Navy, yes.
That's why I said "they will need to be built in large numbers" and "each ship will need a lot of escorts".
And if the Navy also had its own nuclear asset, that would further enhance the survivability of the nuclear deterrent. This complicates and costs preemptive efforts even more: previously, you could just focus your expertise on destroying missile bunkers and hunting down TELs. Now, you still have to destroy bunkers and TELs, but you also have to hunt down missile-carrying surface ships, missile-carrying submarines, and even missile-carrying aircrafts. They are all scattered, well-protected, and highly camouflaged/lethal.
A strong navy, equipped with new and better equipment, and with more budgets will also ensure the loyalty and dedication of naval leaders and officers, who have often been put behind other priorities throughout history.
To supplement my argument, let me quote The Diplomat:
The timeline for NK is moving ahead. The time of their partially self imposed and partially UN imposed isolation may end soon. And furthermore there may come a day sooner than most think where NK will be given at least nominal ownership of the whole peninsula. That means inheriting a much larger military role in the alliance framework than they ever have before. Including operating blue water ships.
They need sailors and pilots when that day comes.