Their main problem is that they ruined the IP releasing mediocre games for a decade, the disgraceful Lightning trilogy, the unfinished FFXV shipped as a collage of the only pieces they had ready glued together, now a DMC clone forced to be played in easy mode with brain dead fillers.
The Remake project has been the only real bright spot quality wise in a decade and Rebirth is what a AAA FF should be. Too bad it took a decade to get there and in the form of a splitted game where it's hard to retain fans, many move on and others find difficult to step in because they haven't played the previous games (and about this...watch Nomura trying to release Kingdom Hearts 4 still based on a shitty story fractured among 10 games from 20 years ago
).
In the meantime they haven't cultivated a fanbase, too many identity changes, too low quality, their fans are still those that love them for the Squaresoft golden era of FF7-8-9-10 that has never been replicated.
But this is an aging fanbase that becomes smaller as years pass and they haven't given new generations any reason to get invested in the series.
Releasing games on other platforms is just a band aid for these huge problems and indeed we have seen that releasing Remake and XVI on PC and XIV on Xbox hasn't made any practical difference.
