He's still a beast of a defender. Another thing that he brings that can't be measured is confidence within the team. You know damn right when guys like Drogba and Terry are on the team sheet, the entire team's confidence level rises. We have already lost Drogba and can't afford to loose Terry as well. Those two have so much influence over the entire club that earlier this year, I was very very worried that Chelsea would end up like Arsenal when Drogba and Terry leave, more so Terry. A team with good players but no leaders, teams like that can win games, but you aint winning trophies. Thankfully with the emergence of guys like Luiz and Cahill I am not as worried, but the coming season is still a year too soon imo to phase out Terry. For Chelsea's sake, Terry should NEVER leave the club. Once he retires he should be part of the staff right away, you can't loose a guy like him, you loose half of your identity, half of your soul. He has an impact not only on the goals conceded but the ENTIRE club, from the youth team to the first squad.