Claymore
3x3 Eyes
So maybe they really would have changed their mind about FF7 now?
Unfortunately I believe it's the reverse. After looking at the original interviews in the wake of the Remake's announcement, and the exclusivity announcement for it on the PS4, there was this underlining notion that they really wanted to help support the console and make it shift, especially in Japan where mobile and handheld gaming is more prevalent. There has been a ton of speculation over the past few years whether the PS4 and Xbox would be the last actual 'consoles' as we knew them, before moving on to this all-online, download only concept that has begun to rear it's head over and over again. With the PS5 on the horizon, nothing about this will have changed, they will want to support this traditional concept of a console as much as possible, and multi installments of the Remake would allow them to do that.
There's also the increase in development time for projects on such a scale, and with their vision of expanding the original game, it all just points to it seeming highly unlikely that we'll get it all within one installment.*
* Baring the final Ultimate GOTY Edition, which probably still won't contain all the DLCs lol.