https://www.polygon.com/2017/8/23/16189646/final-fantasy-15-sequel-hajime-tabata-interview-gamescom

The Final Fantasy 15 universe continues to grow, but a full sequel isn’t in the cards. Director Hajime Tabata told Polygon during an interview at Gamescom that, unlike other continuations in the franchise, Square Enix wants to keep exploring Final Fantasy 15 in smaller ways.

“If you do that full sequel model of expanding on an IP or a series, it’s good in certain ways,” said Tabata. “The negative of that is there’s a very large open period where you’re not releasing anything. In that period, you get people to move away, and their attachment to the franchise dissipates a little bit.”