I think this is an interesting question. Seeing as FFXV looks like it will release next year, it won't be long until FFXVI is announced, possibly in 2016 or 2017. That being the case, who you want to direct the game?
For the selection list, I've only included FF directors that are still employed at Square Enix as of April 2015. Also, the directors of the MMORPG mainline FF games (Akihiko Matsui for FFXI, and Naoki Yoshida for FFXIV) have been excluded, as they are unlikely to direct single-player titles due to being busy with their respective MMORPGs.
For the selection list, I've only included FF directors that are still employed at Square Enix as of April 2015. Also, the directors of the MMORPG mainline FF games (Akihiko Matsui for FFXI, and Naoki Yoshida for FFXIV) have been excluded, as they are unlikely to direct single-player titles due to being busy with their respective MMORPGs.