Lets be patient and wait till Sachin breaks the record for highest rungetter in tests (Even if it means India losing more matches and series). We can't expect Sachin retiring before achieving the feat and can't imagine our selectors dropping him for anything.
I remember what some players and selectors said sometime back. Having Sachin in the dressing room, even if he's not playing due to injury, is a morale booster for other team members.
If this is true, I can't imagine if we can win against Bangladesh if he retires. Hope he continues playing as long as possible to keep us above Bangladesh in the Test Rankings.