The main issues of the economic are the changes made by SE and the game design itself.
More and more players have serveral DoH/DoL and more and more players have already geared up with myth/CT and do not have a plan to play an Alt job.
Most players do not need philo tomes any more and they can easily get 400+ for playing 90min a day.
Not enough new players and gears once made never broke.
ilv45 gears can be SB to tier4 materias and the quest reward give them too.
PvP is not that popluar and you can only craft the beginner level gears.
2.1 is designed to make everyone poor in gil.
This does not need to be a bad thing for most players who have little interests to grind a huge amount of gil. The only thing cost a lot of gil is FC house (they plan to lower the price too) and furture personal house. Everything else (ilv70 HQ gears, materias, iLv90 gears, DoH/DoL levels, etc...) can be grinded out by just playing the content.