I mean 12, 13 and 13-2 still had turn based combat in a sense, in that the ATB was still a thing (granted with more real time elements) so it's not like we got NOTHING in this period. It's after 13-2 where they cease to even be turn-based adjacent.
There also WERE other turn-based games in this period such as the Atelier series, even ones that did really well such as Persona. It's just that Final Fantasy had moved away from it, with no real justification for doing so.
Expedition 33 is just the final nail in the coffin of ANY argument that you can't make a movie-like cinematic adventure with turn-based combat (which of course is their main excuse) and have it sell well.
To be clear Lightning Returns, FFXV and FFXVI are still not BAD games. Two of them I'd even say are still pretty good games (and the other I've still not played enough of to judge for myself), but we're really seeing more and more that the decision to move and keep moving away from turn-based combat was just a bad one, it just was.