While we might all be focused on other games in the series, Square Enix hasn't forgotten about the Final Fantasy X universe - and in fact, some of the key elements of a continuation of that world already exist.
In a new interview with Japanese gaming magazine Famitsu that's been reported on Japanese blogs, key FF10 staff discuss the concept of a sequel to that game, and explain where they're at on it.
"If we are to make X-3, we somehow have a synopsis written by Nojima-san," explains character designer Tetsuya Nomura, who has recently been busy as the creative lead on revisiting another Final Fantasy world with FF7 Remake. "It's sleeping right now, but the plot itself does exist."
"I had the opportunity to work with people who entered the game industry after playing FF7. But now that phase has moved and now I'm going with people who entered after playing FFX," adds Kazushige Nojima, the scenario writer of the original FF10 as well as this new sequel plot treatment.
Ultimately, any sequel will likely use a recent audio play as a storyline springboard. The HD Remaster of the FF10 series features a new story called Final Fantasy X -Will-, an audio drama recorded by bringing back the voice stars of the original game.
The audio drama takes place one year after the events of Final Fantasy X-2, and while it's focused on two new characters called Chuami and Kurgum, it features Tidus, Yuna, Lulu, and Wakka post-FF10. Tetsuya Nomura even produced concept art of the slightly older versions of the beloved characters, as well as the newcomers.
The story touches on many themes of FF10 in its brief runtime, but the basic thrust of it is that it emerges that if Tidus can return, as he does in FF10-2, so too can Sin. Sin does thus promptly return, and the story ends with Yuna declaring she will defeat Sin again.
FF10 lead Motomu Toriyama also spoke to Famitsu, noting that there's no real possibility of this happening while the multi-part adventure of FF7 Remake is still in production. That means any FF10 sequel will be a while off - FF7 Remake is likely to run for at least two or three more games.
"The probability is not zero," Toriyama says of a Final Fantasy X-3, "But we are not in a phase where we can talk about it, unless we have finished producing FF7 Remake."
A Final Fantasy X-3 story synopsis exists & the possibility of it being made "is not zero" | RPG Site
Another sequel could be on the cards.
I would take Final Fantasy X-3 over any more Final Fantasy remakes to be honest. Final Fantasy X is one of my favorite titles in the series.