In the MK Airlines crash in Halifax in 2004, the rear fuselage struck an earth berm supporting the localizer antennae 300 m beyond the end of the runway. This caused the rear fuselage to separate from the aircraft. Had the wall in Trichy been more a more substantial obstacle, we could have been looking at a repeat. Unfortunately airports can't always be built in ideal locations, the boom in air travel, particularly in developing countries has resulted in many airports carrying a much higher traffic volume of larger aircraft than they were designed to. Lax urban development controls have resulted in housing encroaching closer to runways than should be allowed. Many times I've operated into an airport and thought any over run would result in a disaster.
If the explanation regarding the Captains seat is correct, the question is was there a fault in the mechanism or was it not adjusted properly prior to take off ? As I'm not a B737 pilot, could someone perhaps explain how the seat adjustment works ? Is the seat moved manually requiring a pin to lock into a hole, which would explain the seat moving backwards on rotation if it was not secured correctly, or is another method used.
Cessna seats were so bad that many aircraft had a hole drilled and a bolt installed in the guide rail, to limit rearward travel in the event that the seat came unlocked.