Add MapDB to the party.
Demigods probably can't take advantage of it at this point, but I plan on using it with Infractions and the Capitalism plugin.

If in the (unlikely) future we decide to move Demigods to MapDB, tons of the save code will need to be rewritten... by hand.  Because of this, we should decide right now if we want to use it or not in DG3, and never look back.