The big battleship existed to deliver massive ordnance over long distances. The end began in WWII, and now are so many other ways to deliver massive ordnance now, that role of the battleship is finished. Plus - it is a huge, expensive target for supersonic anti-ship missiles that nearly every tinpot dictator possesses now.
I wonder how effective those missiles would be. They are designed to go through the thin skin of a modern ship.