Though Remember 11's TIPs mentioning that the Infinity Series will continue forever has been put under Hilarious in Hindsight and Harsher in Hindsight, there's a case to be made that this dissonance was intentional.
The "next" game in the series is 12Riven however, it's not really an Infinity game at all, instead being being part of the very short-lived Integral Series, only being shoved onto the end of Infinity due to the developer doing bankrupt. Since the studio was bankrupt, the next game (Code_18) has nothing to do with the original developers.
Thus, neither of the sequels to Remember 11 are true sequels at all.
But, Remember 11 has been described by the developers as "an endless revenge story", and the most popular fan theory concludes that Self is being trapped in the Infinity Loop with the promise of a conclusive ending. After Self experiences Kokoro's Route, it probably chooses to experience Satoru's Route. After Self experiences Satoru's Route, it probably chooses to experience Kokoro's Route.
After Kokoro's Route comes Satoru's Route. After Satoru's Route comes Kokoro's Route.
The Infinity Series will continue forever.
