Let's find out in a few months, if the NTSB or Boeing is allowed access to the flight data recorder, whether the flaps and stab trim were set correctly, required EPR/N1 and correct takeoff speed bugs set and complied with.
Let's also find out what other flightcrew members can learn from it, and about density altitude, winds and runway length, whether all checklists were completed etc. Actual takeoff weight, versus whether it was up to the max. runway, climb or structural weight limit? This can help experienced pilots and especially the more inexperienced, around the world. How about the aircraft's recent maintenance and the fuel quantity in each wing?