Board Thread:General Discussion/@comment-4786757-20170516221557/@comment-31292614-20170517221219

Sandra Oh has expressed interest in returning for the season finale, Katherine Hiegel is never going to return since Shonda doesn't have any plans to put Izzie in.

I think Grey's could go on for at least 2+ years at minium, but most likely more since the  Megan Hunt storyline being found.