Why do that? If the Chinese ever tried a large scale invasion across the Pacific, tactical nukes would be a far more efficient way to stop their fleet. In the middle of the ocean you also don't have to worry about pesky fallout and lingering radiation after the fact.
Ships like this should only be a second line of defense, to take down the few lucky ships that make it though our nuclear barrage unscathed.
You are forgetting about Naval Gunfire Support for land forces.
After all something has to replace the Battleships.
Across the Pacific?
I'm thinking more of this happening in the South China Sea, the Straits for Formosa, or the Sea of Japan.