for me only Baines, Williams, Barkley, Lukaku (who most likely will have gone anyway), Bolasie, Gana, Stek (reserve), Coleman and the younger players are worth retaining - maybe Deulofeu at a push
The rest can do one for one or another reason.
NGE - Robles, Kone* Niasse*, McGeady*, Cleverley*, RFM, Lennon
Unfit: Gibson*, Besic, Oviedo*, Macca*
OTT - Jags*, Barry
CBA Players: Mirallas and Geri
The ones that need to be shipped out - in the next 12-18 months - include Barry, Mirallas, Jags (or RFM) and a few other benchwarmers.
The ones to retain (above) are 8 starters and the kids - of those 8 senior players only Gana and Barkley (and perhaps Coleman) have a realistic chance of being first team material 3-4 years down the line (I'd expect Lukaku and Bolasie to be gone and the other three to be close to retired). So, in a nutshell, a whole new team is needed.
* = must go ASAP.