I was once optimistic that the Cold War navies would start appearing after Dragon released those excellent 1/700 U.S. CGNs of the Virginia class, their two different versions of the Long Beach, and the conventional Chicago and Albany to go with the Adams class destroyer. However, nothing further developed.
I was hopeful that we would finally see a good 1/350 kit of the square-bridge Fletcher, perhaps even a 1/350 Adams class ship, but, oh well . . .
Yet, the recent releases of the Kennedy, Kitty Hawk, and Constellation have revived some of those hopes!
I would also love to see more 1/700 ships of the Dreadnought era. John suggested the Lion; perhaps Tiger as well. There is , however, a real option here. Combrig has an outstanding and quite thorough selection of First World War ships and pre-Dreadnoughts in resin for very affordable prices. I do have several of these, including the Tiger and Iron Duke classes. The only drawback is that these are waterline only kits; I prefer full hull.
Manufacturers, if you are reading this . . .
Bill