Square Enix is taking the PC market a little more seriously for their flagship franchise thanks in part to Final Fantasy VII and Final Fantasy VIII's successful re-releases on Steam. In fact, Square's even taking Final Fantasy XIV: A Realm Reborn to the service to further expand the already-successful MMO's reach. Furthormore, Final Fantasy producer Yoshinori Kitase said that although Final Fantasy XV will only be available on Xbox One and PlayStation 4, the company sees potential in bringing future entries to the PC.
Early on in the development of the Final Fantasy XIII series, Square Enix considered the possibility of bringing one or more of the games to PC, but decided against it thanks in part to a smaller market. With Final Fantasy XIV's success and the popularity of VII and VIII on Steam, they seem to have underestimated the market's potential.
Kitase admits that Square Enix doesn't have much experience with PC gaming, but it's something they're interested in exploring after they've gained more:
"Final Fantasy 7 and 8 are now available on PC and they've been proving quite popular ... It's an early stage for us. We haven't got an awful lot of experience in this field. So when we have more know-how and experience in this market we would be very interested."
Final Fantasy XVI would surely be a hit on PC. Who knows, if XV is successful and gamers love both that and the eventual XVI, we might eventually see that Final Fantasy VII remake we've been asking for...