This is my only real major concern. The game almost looks TOO good, to the point where I can't help but worry a bit about if they can keep this level of quality consistent over several games.
I think the correct answer to this concern is that they need to take as long and make as many parts as necessary to do it justice. And we, as fans, need to accept that good things come to those who wait.
On a major positive note, with how much hype and positive reception they're getting, I don't think they have to worry about sales.
Watching Max run through the old 2005 PS3 tech demo, and even the 2017
Remake trailer, one thought that immediately leapt to mind was: man, I'm really glad that it's taken them until 2020 to release this game. If they had forced it out sooner, imagine how compromised an experience it would have been compared to what we're getting now.
If this is the level of depth and polish they're infusing into just the Midgar section of the game, I really don't want them to compromise on the rest of the game just to get it out the door faster. If it takes four parts and five years to get the complete story, but the final volume and quality of content completely dwarfs the original, it will have been well worth the wait for me.