Yeah Tauri you're right, it will take a while. But if people wise up and don't buy these over priced items for a month, let's say, then it will drop quick. (Not like people will do that though :-b).
If people continue to pay the gouged rate, they'll keep going higher because the supply is going to go down. That's about the only positive you'll see from the gil seller clans, they kept the supplies up in the AH. The problem being that they jacked the rates up so high that they'll climb from there vs. where they were.