Castle Town is pretty much Zelda's Hogsmeade. It's the iconic area that pretty much can't be ignored. In addition to those shops I think a Royal Banquet Hall in the castle would be cool with the Temple of Time housing the main E Ticket.Item Shop, Potion Shop, Shooting gallery are all in Kakariko too.
A whole park could be made from the areas of Zelda but since this would only be one land they would have to go with the one that's easiest to showcase different aspects of the series.I mean, Castle Town is no better than Kakariko in the visual department.
If they ever do Zelda Kokiri Forest, Death Mountain/Goron Village, or Zora's Domain are by far more interesting than the castle.