FMP is based off a series of novels, which is still ongoing. I read the next season's worth already (someone translated the novel into English). I'm guessing it'll be made into anime sooner or later.
According to the author, the season after The Second Raid is the last of the short and sweet story lines that can be finished in one season. After that, the plot will be too big to contain within one season.
Btw, hi sath! I'm still alive... just... taking a semester off from FFXI. My brother started playing again, so if you see my char online, it's him 2boxing.
EDIT:
The link below goes to a fangroup that is translating the novels. Click / download / read at your own risk. Personally, I found it helpful to read in addition to just watching the anime series, because these novels show what the characters are thinking.
** Spoilers **
http://www.boku-tachi.net/pr_fmpnovels.html