Board Thread:General Discussion/@comment-4786757-20170516221557/@comment-4287993-20170922065918

Private Practice ratings weren't too good either, so I think that if Kate had decided to stay, there would have been a full sixth season and then probably a full seventh and final season.

I'm not too sure the firefighter series will be more successful than Grey's. If Ellen's in, I think Grey's will outlive the spin-off.