I don't think anyone seriously expected the remake of Final Fantasy VII to celebrate 5M 4 months after its release, but maybe I was just overestimating it.
This is the thing, enthusiast fans have been overestimating this Remake, probably because how long it took to be made. They expected it to be the holy grail of gaming... but this is with a vision of the gaming landscape that is outdated to 2020.
A lot of the current customers, don't care that much for the Final Fantasy IP, they also don't care about the jRPG genre... hell, they have 0 nostalgia abut FF7 because they weren't even born.
It's an important game but the overhyping of this remake reached a point that ended up being more "mythical" than real, if it makes sense.