The game would maybe it 7m after the holiday and 10m lifetime once sequels come out. Not bad at all, its definitely seen weaker legs then I expected but I think that would simply be down to damage to the franchise with the last decade worth of entries. Its clear from the PS4 hardware boost that Nolstagia was a big draw and brought back people who has left the console gaming space this gen. Potentially for a large number of younger/newer gamers, FFVII simply doesn't have the weight we think it does. Even more reason for FFXVI to release sooner than later and hopefully establish a new audience.
Also let's see if the game is very price elastic, its having its first sales on the PSN store this month.