The only players I see with little/nothing to offer are Distin, Alcaraz, McGeady and Kone. Add Atsu to this as a wasted loan. I would be happy to see all of the above go.
Players like Osman, Pienaar, Barry and Howard are still important SQUAD players and will be next season (??? over Pienaar's fitness though).
I would say Osman, Hibbert, Jagielka and Baines' importance goes beyond the pitch - to me, as local lads they are needed throughout different stages of the club - the role-models/ambassadors for youngsters, the local community link.
We're quick to write off players after a poor season. Too many wholesale changes (which gladly won't happen) can ruin previous hard-work and foundations.