If they use the Cassandra Cain Batgirl, she probably wouldn't be so bad. The one I'm not sure I want to see is Penguin. Not because I don't think he could be great, but because there's very few people who have the right stature to play him who aren't known for comedy. Danny DeVito's performance was rare, and Bob Hoskins, no longer Eddie Valiant, looks worse for the role than even a makeup job could cure. If someone like John Rhys-Davies came along, they would be my first candidate. If that happened, I like to entertain myself with fantasies of his deformity coming from thugs who broke his nose, put a welding torch to his fingers, and smashed his hip with a crowbar before Batman intervened. So you see, nothing is impossible to do if they do it right. Even Robin.