Thanks to a interview with a Magazine, there’re great news for those who’re waiting for Theatrhythm Final Fantasy: Curtain Call, including for those who wanted to wait if there was another sequel first. Square-Enix producer Ichiro Hazama said:
The songs themselves have great quality and stand up on their own, no question. Also, because they are used in games, I think that when people hear these songs they remember a particular scene or moment in the game.
Considering the game has 221 songs without the DLC, it’s a pretty huge quantity of songs that will last forever before finishing it, and new games can be added with DLC on the future. This means there won’t be a new Theatrhythm game in the future as well.