Trump is a narcissist, I am not sure what kind of a President he would make. That said there was at least one question that was in the vein of the Jerry Springer show. I was disappointed in Megan Kelly. I thought she was an actual news person.
Trump not showing up doing nothing but good things for him. He is showing that he does not play by the conventional rules, he is his own man, and it is likely that the ratings on the debate will be much lower without him.
No, it shows that he's afraid of a woman asking him a question.