I posted a fix to inflation on Suggestion box a while ago but no one will listen.
Make some Cartel Market items untradable (like hypercrates, master datacrons, Acount unlocks etc) so you can still keep your base of people spending $$$ on the game. Then make a Credit <-> Cartel Coin transfer NPC, available only to subscribers. Yeah they may loose a little income from cartel coin sales, but would balance out with gained subscriptions and increased player base from people who want to use the NPC.