I think there was a strong support for a second movie but this wasn't well made, no fault to anyone but the screen writers and director who wanted a money grab movie.
One thing that significantly irks me is Barbra gets assaulted, Diana shows up gives the guy a good'Ol push and saves Barbra, but they leave this assualter ... no cops, or anything to prevent the man from assaulting in the future... Which of course he does and who's path does he cross again? Well Barbra's of course, whom can fight back now, que ominous music because Barbra kicks her assulater too much and thus starts a villainous path and her assualter gets empathy... I just don't understand the message DC wanted to express there?