I don't think any kind of rollback is warranted. If they really wanted to put a stop to the gil making, they could have done so the first day. They expected some people would make money off this, they just didn't think so many would do it and would gain as much as they did.

I spend the majority of my time playing the market in MMOs so I've seen things like this come and go. Inevitably, the wealthy players stay wealthy because they know how to make money the legitimate way and are very efficient at it. Not only this, but they spend wisely.

On the flip side, players who generally have no money in MMOs will blow through whatever money they made almost overnight and will be right back where they started except now they have a few overpriced pieces of gear on them.

I can pretty much guarantee you that everything is going to go right back to normal within a week, maybe two tops.