Forza Motorsport 7 will be the Lowest selling game in the series, i dont think it will reach Forza 6 numbers.
The game is at #109 in Amazon.
For a game released a couple of days ago, that is HORRIBLE no matter how you slice it.
If GT Sport manages to catch the attention of old aficionados and new audience seeking for a racing sim on the PS4, i think it could be done.
It wont be easy, but it is not impossibru!