Yeah, look at the post above this one...the dude's apologizing now.
That doesn't sound like a guy who knows he's got a strong hand of cards to play. He knows he's toast.
Actually, it's a smart move on his part for when this thing ends up in court. Now, he can not only use the fact what he said is not covered in the NBA by-laws as a reason to take his team, he can also say that he is remorseful, tried to make amends and tried to avoid a long legal battle.
From a legal standpoint, as reprehensible as his statements were, they simply don't appear to rise to the level of being something that the NBA can legally take his team from him for. Shelly's case to keep her 50% is even stronger than his.
Basically, unless the NBA can somehow convince both Sterlings to voluntarily sell their half of the team (which seems unlikely given their recent comments), the NBA is in for a long legal battle that they are unlikely to win.