I didn't say Nomura wasn't going to be involved, only that the age thing isn't really going to be a concern since, as I said before, that was mostly about kicking off the project, not in its continuation.
And SE being aware of it doesn't mean they are going to shorten development time simply because no one can get their hands on one because, quite frankly, that's Sony's problem, not theirs. And their actions so far have not shown they are willing to accommodate the consumer, regardless of awareness to problems.
The Remake as attracting a whole bunch of new people to both Final Fantasy as a whole and to FF7 in particular. They have never been dependent on the original audience to make their sales for this. Indeed, if they were, they would have been less inclined to change anything, since that would alienate the same demographic. FF7 is also enough of a pop culture video game icon to not need its original audience as well. Sheer curiosity takes care of it, whatever the part may be.
The timeline argument doesn't have a basis in reality, except in the actual launching of the project, which is already done. SE has enough other IPs to keep people sated while 7R cooks, and if people fall away due to age or lack of interest, that does not stop new people from coming in to replace them, who would have been too young for part 1 or who may have otherwise recently come into gaming as a hobby otherwise.
From a bottom line perspective, it makes more sense for them to follow the pattern they've established these last three/four years as originally stated of giving each of their tentpole games a year of marketing and letting the audiences soak it in. They aren't going to change that just for 7R2, especially not against a brand new mainline Final Fantasy, when SE absolutely is trying to move on from the stink of the old era that ended with FF15, in terms of mainline games.