I also think bitcoin gold is just others like coins named Bitcoin cash or another name, and someone say to not invest on this coins because is risky and choose bitcoin only, but anyway people do what they want and maybe some of this coins will succeed over time.
It all depends on the user and the holder in the world of cryptocurrency to be taken where he is going. because after all Bitcoin Gold is almost the same as other Bitcoin forks that have not been able to surpass Bitcoin itself. pretty hard to surpass other bitcoin forks. but if the users / holders and makers are sure it can happen