He's about to turn 32. You are aware of the clubs new policy with regards to players older than 30, yes?
He has disgraced the club on multiple occasions, lost a couple yards of pace he could not afford to lose, and has started to pick up injuries with regularity after a career in which he has played pretty much every game for Chelsea over a long period. It looks like Lamps and Cashley are gone after this season. Do you really expect Terry to outlast them by very long?