I think it is eventually him not being able to perform well because of confidence. Or I think I should say lack of confidence. He obviously had a lot of potential. But people put too much responsibility and also expected a lot from him. He just could not handle the pressure. Being compared with LeBron James is obviously a big thing for any player. Obviously, that is going to constantly ring a bell in his mind that he has to perform better than others. And he talked about it a little too much. Anyway, his future does not look so bright at this moment, to be honest.
If he is really that good as advertised, then he can thrived with all the media attention, just like Lebron. But if he is just an ordinary kid which happen to be just tall and his style of play is only good in amateurs, then maybe he won't last in the league.
So let's see, for sure he is in good hands with Spurs specially with coach Pop, and maybe he is not only being build outside, but from inside as well. To be though mentally so that he can endure all this attention that he is getting.
We will likely see in the next few months and years if Wemby is indeed that kind of player that everybody is thinking, I know he is overwhelmed and felt a big pressure in his first game because everybody is looking at him but once he will be accustomed to it, Wemby's true potential and identity will finally be revealed and by that time, we will know if he's exactly suited for NBA or he was just overrated and will be one of those guys that will vanish from the limelight.