Kimberly McCullough/Robin, I read a while back that she is "always welcome to return" either for short time or long. So I really doubt that they'll kill her off. I also doubt that the whole family will leave. Patrick is an integral part of the show, especially with Sabrina's baby now. My best guess is that she will still be there, but an off camera character, not working in the Hospita. Maybe she'll get a grant to work on her big cure thing & be doing it somewhere else, either in Port Charles or a neighboring town, so she won't be seen on the show.