It seems to me that Birds of Prey began down the road to cancellation when Black Canary was stolen by the JLA and Green Arrow books. The Babs/Dinah dynamic was lost and despite the talents of Gail and subsequent writers, the book had lost something.
Now Dinah has been sidelined from the League and the Green Arrow/Black Canary book looks to be on an irreversible downward spiral I wonder if there's any reason we can't have Birds of Prey back. Sure, Babs has a role in the new Batgirl book, but Lord knows, Oracle can multitask. I'd love to see Gail pitch DC at least a special, or series of minis. Hey, it worked once before.