I get the feeling the Unending Codex will need a far more robust manner of organization than it currently has (ie "All", "People", and "Concepts") when the game starts really piling on the entries.

Also probably some means of cross-referencing and cross-linking. For example, we can't describe Aymeric without talking about Archbishop Thordan, and we can't talk about Archbishop Thordan without talking about the Dragonsong War. Each of which are worth full entries in their own right, but it would be good to link them, like some sort of in-game wiki.

I'm also wondering how we'll be able to obtain the entries of people who are no longer around and whose stories are done, like Ysayle or Livia. Or if we'll get entries for side-content characters, like the Four Lords.

It does get a bit amusingly understandable when some of the entries go into some detail about the primary story the character has been on, eg Estinien and his childhood and time as a Dragoon and as Nidhogg's thrall, and then for more recent Endwalker events it just goes "and then they contributed to solving the Final Days".