I've started adding "Wonders of the World" discreetly to the game. There are several more in DE. I'd like to have a "Wonder of the World" game mode, similar to "Capture the Wonder" or "King of the Hill" in other games, where the script places a gaia-owned Wonder in the center of the map and the player or team who captures it either gains victory (after a designated time) or gains some kind of large benefit. We can retrofit the random map scripts to allow for the mode. In DE, I've kind of done it as a proof of concept on a couple skirmish maps, but I don't have the scripting knowledge to make it into a mode, let alone add it as an option for RMSs.
They are not a realistic size any way you slice it. Neither is anything else in the game, now that I mention it. The only real reason to keep them "large" would be for turreting troops on-deck, but it's debatable whether that would be a bridge too far in the APM department. Maybe I'm nostalgic for the old Age of Empires: Rise of Rome deathmatch naval battles of my youth, when we'd all pick Greeks, Phoenicians, or Minoans and have 100 juggernauts per player duking it out on 'small islands' maps.