Most of Spider-Man's rogues have not been seen in the book in decades. I think that it's fair to say that some of them would be better off in other books or create a team with some of them and send them off else where. Also, Slott originally wanted to use the Black Cat in End of the Earth storyline instead of Silver Sable because she was being used in Daredevil's world. And if Matt Fraction's The Defenders continued, Felicia would have been a part of the team. It's too bad that the Black Cat wasn't tied down to Daredevil's world a bit longer.
If the Black Cat was used in EoE, Slott would have killed her off.