If you were to make FF15

[Bolivar]

First thing in development would be the story. Tanaka (reallly the original concept creator for FF) would come up with the world, loosely based on the FF tradition. Then Sakaguchi & Nomura would write an original story, with Nojima & Kitase adapting it into a game.

The Battles would use the 4-person party, but make sure it's not too slow - the battles would be as engaging, fast and intense as in VII, but you could bring the 4-person strategy into it. Hiroyuki Itou would handle it, but it would have to be RANDOM ENCOUNTERS

Uematsu would have to do the music. This series is just as much his as it is anybody elses, maybe even mostly his. The man's music defined what FF is all about and I think for him to leave the company is a very disgraceful thing to do. I would make him do it, with Mitsuda assisting.

Nomura and Amano working together on the character design like they did in VI & VII.

Basically the game would be divided into different parts. One would seem really futuristic while the other would be very castle-fantasy-midieval and the two would seem very different, and odd to be in the same game. Then the third part takes place in a society that isn't cought up in hierarchies - but it's been the victim of injustice of both the other 2 societies, and eventually the different characters of these different lands meet up and cross over to reveal what goes on in the world as a whole. I would give the 3 different parts to different directors, Sakaguchi, Kitase, and possible Matsuno, so they each could compete to bring the best scenario. The stories would take place all over the world and after completing them one after the other you can really do anything you want ala "World of Ruin"/Disc3 FFVII. Then the Final Boss...

It would be so big it would be 3 DVDS. Yeah...

edit: oh yeah, most important. There would be a love triangle between 3 of the girls in the party...