Luckily they are also increasing the money supply by increasing gil rewards from various tools players have. For example, dungeons that previously didn't have gil drops will have gil, leves are getting a bigger gil reward, treasure hunting events, etc.

We don't know what data SE currently has on the money trend, but from the public outcry on the forums it seems like a large majority of gil in circulation is sitting with a low percentile of players. Hopefully housing gets the money moving again or out of the markets to force equilibrium again.