I stand by thinking that FF3/6 would be best if done as a two parter. I know this topic is two years old now but I don't care. I have a buddy working on the Narnia flicks doing makeup and I'm writing a script for New Line's VP so who knows what will happen in the future. I'm probably going to take a break after I finish this script but I think what I'm writing next will be an animated fantasy film and I will definitely borrow tons of themes from the games I grew up on. (I'm not blatantly stealing anything, it's just nods)
Still, it's a shame nobody with the right know-how or power has noticed FF3's potential as a film.