My list of ideas to make Eorzea feel more alive (in any given order):
- addition of story driven dialogue from ALL NPCs in all cities, from small one liners to entire tales (text is just fine)
- addition of 1000+ quests for absolutely everything, each one telling a little more of the story and lore
- addition of 100+ roaming Notorious Monsters small and large, scattered all over Eorzea that all drop ra/ex equipment
- addition of more and diverse (climate/terrain) dungeons, with treasure chests, and quests associated with exploring and looting these chests
- addition of several smaller towns, with unique story lines, quests and items associated with it
- small mini-games unique to each city (gambling, tournaments, etc) that players can compete with one another
- traveling quests are always a great way to introduce all of the areas to explore (escort quests come to mind)
- Chocobos, and Chocobo music
- much more interesting ferry rides (sea monsters and pirates, yes please)