Unpopular opinion here, but if they keep the quality and content level of this game each time, they can release it in however many parts they want for all I care. I love these characters and I’d love to see significant story expansion that stays within the framework of the original. The original is always there to play for that version of the story. I think of it like the OG is the movie and the Remake is the multi-season TV adaption. The latter allows you to spend more time with the characters and flesh out elements a movie doesn’t have time for.
That being said, I take Nomura’s comments to be referring to just a slight difference in the number of entries. Like 3 compared to 4 or 5, max. The main concern is that they want the whole original game adapted and expanded on at the same scale and quality as Midgar was. If they do that, it will take more or less the same amount of time to develop the full saga regardless. Dividing it up into more parts will just get us some of the content faster while also keeping development of the project funded which will help them avoid the need to rush or cut corners.
TL;DR: I’m fine with the project taking it’s time so we get a higher quality experience. More parts adapting shorter sections of the OG game into full fledged games seems like the best option to me to ensure a healthier production process and that we won’t have to wait another five years for the next game.