The card game from FFIX had a lot of potential, but there are so many improvements that could be made through an MMO platform. If cards were obtainable through certain events, such as Fates, that could be leveled by defeating X number of a specific enemies or "feeding" certain HQ mats into the card--untradeable or unique items maybe? Additionally, putting stat/ability caps on a cards' ability could help to keep things reasonable, or maybe only a percentage based chance to enhance the card.

Another idea, just as a record for within the Free Companies, the various records for specific fish that are caught. There is similar data in the individual character log, but having a record for specific levels to challenge each other with could add an increase in fishing! As far as I've seen, fishing seems more a way to make a few extra gil and kill time. This could add another facet to its' purpose.

Just a few thoughts.