Yes, the opportunity cost is the real problem with all of this. A navy takes approximately forever to build.

If we are extremely lucky the outcome of this will be increased shipyard capacity and refined shipbuilding practices just in time to switch back to building a multitude of actually-useful ships.

But most likely is that this ends up delaying the U.S.'s ability to build back its navy in time to matter, which is a tremendous issue given how we do our commerce and where some of our deepest friends are physically located.