GT (no A) 6 will certainly bring a lot of people back. Most other games can only hold someone's attention for a few months, maybe a year depending. GT6 could carry us for 2-3 years, and is certain to take the spotlight as soon as it is released.
This brings up an important topic -- that those who play racing games or just game in general get stigmatized by the fact that it is a "game" and that we spend so much time working on, caring about, and perfecting our skills etc. It seems laughable to some, but really it isn't very different from the things those same people do for hobbies.
In fact, our hobby is considerably cheaper than most, though one can spend a lot on gear etc.
I get chastized for being in the basement for hours at a time doing this or that on a 32" screen with some controller of one variety or another. But my wife sits there while we're watching Netflix just staring at her iPhone, so I point out to her that she's not really "watching" the show which is supposed to be what we're doing. I also point out that she merely prefers a 2.5 x 4 in screen where I prefer a larger one.
Just yesterday (or maybe the day before) I pointed this out again and said, "just pick up the damned controller!"
I don't mean to make her sound like a huge bitch, cuz she's not even close (though, every woman has her moments). It's just a good example to point at about the hypocrisy of judging someone for playing a game, especially one that can be as serious and rewarding in so many ways like Gran Turismo.