I mentioned this in another thread, but I don't believe this will be a set of 3 games, unless they cut a bunch of stuff from the game after Midgar.
I think they're going to work around/heavily condense the exploration aspects of the original, which would count as cutting, sure...but at least it's not the story.
A lot of locations in the original (such as the numerous small towns) had only a handful of minutes of main plot, compared to Midgar which had roughly a third of it, so I don't think that's really a concern.
If they commit to "you can totally fly the Highwind around!" then yeah, that's a different story. Something like that would require a specialized team itself over the course of years in today's development climate lol