I'm not sure I buy this either. Bruce could still have taken in Dick without being Batman and mentored Tim as well. As for Selina, as far as I can see it's always been HIM who has pushed her away. Even when he was Bruce Wayne dating her and she didn't know he was Batman and after that it just became magnified. Bruce Wayne is a genius-level A-type personality and one of the richest men on the planet, whether his parents lived or not, he could have done a lot just by being "Bruce" to help Gotham.