All right, maybe I'm crazy. But consider if you will:
Final Fantasy VII was initially known as "the game that sold PlayStation." It became by far the most popular title in the franchise and as of December 2005, it had sold 10 million copies worldwide. Some will quickly say, "Okay, so it took eight years to hit 10 million, while any new Call of Duty sells 10 million in a matter of weeks ." True enough.
But of course, the industry has grown exponentially since 1997 and in some ways, it's almost like accounting for inflation; i.e., $100 today wasn't $100 fifteen years ago. Gaming has gone mainstream; it has become super huge and let's not forget another critical factor: The mystique surrounding FFVII and its overall legacy has expanded greatly over the past decade and a half, partly due to the demise of traditional turn-based mechanics and the declining quality of JRPGs overall. Oh, and the direction of the Final Fantasy series, which most hardcore fans have seen only one way…and that way is down.
Millions also signed a petition to see the FFVII remake come into existence. Those are guaranteed sales right there (for the most part), and it hardly consists of every last individual who would purchase a remake. On top of which, if you produced it now for the PS3 and Xbox 360, you're looking at a combined userbase of what, 130 million? At last count , that sounds about right. And how many PlayStations were in the world when FFVII launched fifteen years ago? The comparison is absurd and although I'm sure far more PS3 owners would buy an FFVII remake, you can't completely discount 67 million 360 owners.
Lastly, let's assume it only costs $30, perhaps an accepted price for a remake. Do you have any idea how attractive that would be to a gigantic number of people? Hell, make it available digitally and physically and if it doesn't sell 20-25 million (perhaps over a few years, but still), I'd honestly be surprised. That's all I'm saying.