Not to beat a dead horse, but the original show had Fiona and Steve/Jimmy gone after season 1. Put a major twist in the show. It was Lip, Debbie, and Ian on their own basically taking care of Liam and a drunk frank, or vice versa. Then it became a shell of itself a few seasons in when Debbie and Lip left and it was just Frank with Ian and Liam, and then just Ian. Now its Frank by himself attached to some family and the "Milkovich's" and has changing story lines involving the denizens of the neighborhood. still a good show. only a few episodes left in the series.
My thoughts for next season are that Fiona will take a backseat and if jimmy is dead, they may start moving to the UK story structure with the kids on their own with their own storylines