it used to be 8k/9k per usd hell, even 10k used to be an instasell, but now that the tc rates are around 15-16k I wanted to know if it will ever go down, or if there is a possible way for it to go down, asides from mass sinking tc.

I dont think they ever will unless they implement some sort of item or goodie that requires a huge tc sink.

I would say the new ranking rewards is a huge factor in this problem, and it's kinda ruening the fun for us marketeers.

To answer your question in a shorter manner: No I dont think so.

No, it'll only ever go up at a constant because of the tourneys spawning TC into the game.