I don't know about that. It will outsell the other racing games for sure but some people are worried about missing single player. I think we have only seen 5 tracks or something. I know GT Sport won't be GT7 Prologue but from what we have seen so far, i could be a Prologue title after all. Polyphony has to announce some more tracks and features, like single player career.
And after that is said and done, the game has to deliver in terms of driving physics, AI, FFB... this will be tough. PCars 2 will most likely feature an epic career mode with everything motorsport has to offer, like the first one did. I'm looking for endurance races, championships, realistic grids like GT3, dynamic weather and daytime changes, all of that. We already know GT Sport won't have some of these features. So we have to wait and see if this game really lives up to it's name.