1) Tiger doesn't have to do any of this. He doesn't have to have a press conference, he doesn't have to explain himself and he doesn't have to apologize to anyone other than the people he's hurt. He can deal with his personal issues on his own and go back to beating everyone at golf.
2) Answering questions at a press conference is much, much different than reading a prepared statement in front of a group of people. It's much easier to appear sincere when you are answering questions off the top of your head. Reading a prepared statement and making it seem sincere is something only the best actors can do.
3) I think we have to give Tiger the benefit of the doubt. We can't expect Tiger's reputation to suddenly be repaired after one press conference. For now, we have to take him at his word. We won't know if he's actually sincere until we've seen him change his behavior over several years.
4) I understand why Tiger didn't answer any questions. He's in therapy right now. He's working through his past behavior and trying to move forward. He knows that all of the questions are going to be focused on the past. The questions will always be there and there is no need to answer them because there is no benefit to answering those questions.
5) Why do we want answers to the questions about Tiger's sex life? What do we get from that? Some perverse pleasure in knowing that Tiger can screw up too? How can his answers ever be satisfying? We know that he messed around. He's admitted that. Details don't add anything to the story. I hope he never answers those questions.