In an interview to promote Final Fantasy X-2's international release, Yoshinori Kitase revealed "whether other sequels will be created is up to the director of each of the Final Fantasy titles".
So if a Final Fantasy X-3 is created one day, it's up to Motomu Toriyama.
In an interview to promote Final Fantasy X-2's international release, Yoshinori Kitase revealed "whether other sequels will be created is up to the director of each of the Final Fantasy titles".
So if a Final Fantasy X-3 is created one day, it's up to Motomu Toriyama.