I forgot about submarines, and yeah, I wouldn't be surprised if they continue to operate after surface combat ships are retired. If that ever occurs. In regards to hypersonic missiles though, I'd like to point out that a faster missile has a harder time correcting it's course if it's aiming at a moving target. This is a major consideration if a ship is fast enough. If hypersonic missiles become prevalent enough I can see navies turning to faster, smaller platforms. This is especially the case if navies fully utilize small unmanned ariel platforms and severely limit their manned counterparts. A Ford class carrier will be unnecessary at that point in terms of scale.