When should Sachin retire?

If you are a Cricket fan of any nature, I am sure this question must have crossed your mind some time or the other. Sachin Ramesh Tendulkar has been the backbone of Indian Cricket for over a decade now. Considering a Cricket-crazy nation that India is where Cricket is almost the primary religion, you can imagine the mental stress these Cricketers must be going through given the expectations that the "junta" has from them each and every game they play. In this context, imagine the level of expectations from people like SRT, Dravid and likes. How much of this stress can a human body take and for how long?

Agreed that these same Cricketers are paid a fortune to represent BCCI (not India - since BCCI is not a government entity and therefore they are not necessary playing for their country - a whole different subject altogether). However, they are human beings too, you know. I am slowly getting convinced that Sachin's body is getting tired from all the Cricket he has played and the consequences are visible. He is going through a lot of fitness issues and his performance has not been the same. Therefore, looking at the precedence set by "Warnie" & "Pidgeon", should Sach consider retirement at this time? I sincerely feel that he has some more Cricket still left in him.

The ideal scenario would be Sachin retiring at Wankhede after winning the World Cup final in 2010. If it comes to that, I would pay any amount to get in the stadium that day to witness the event.