They can, and they kinda do. In GTS the focus was on racing, in GT7 clearly not as much, although it will still be present. GT7 has to appeal to more players than GTS did. The fact that the game has to focus on a lot of things, ends up becoming a problem. There's a part of the community that wants it to be a Sim, others want really deep tuning, others want the best graphics, others want a free world, etc.
For me the one thing I'm always looking forward, is having as many cars as possible to explore. It's what gives the game longevity.