Gil isn't a problem in the game, we're just stuck with a high number economy. I know loads of people who have or are near 100mil gil, it's not a lot of money. It just looks it because it's a big number. They do need to up the current cap from 999,999,999 however as people will be reaching it before long.

Anyway rolling back anything would be a fast way to kill FFXIV. The playerbase would drop to 0 over night.