Not going to buy the game in current state
That said, it is not a single negative point to come to that conclusion, there is no single game-braker, it's more the overall thing. I will not have fun with GTS for a long time, considering I like driving offline and that immersion is very important to me. Games like Pcars, F1 2016 are far better in that matter. Also, the Gran Turismo AI is ruining offline racing (AI just kills the immersion) and I'm not interested in hot lapping either, because when I want to do hot lapping, I want to do it with the best physics and therefore AC.
If they bring an extended A-Spec (not what we have seen so far, that is probably done in 2 days) then I might consider it. Although, I must admit that I like the way you can race now online. Short races with people that are more or less on your level. But I'm more the endurance racing guy and will find myself in a league with the same guys as always, and they think the same of the Beta as me so far, so the league will 95% not take place in GTS.
There will be a lot of people who see that different and that is okay, because they are looking for something different.