I guess the other question regarding the possibility of the wreckage being found is:
is an attempt made to hoist the wreckage (would seem near impossible to me dependent on depth) or simply map and film it?
When wreckage is found, they send the robot submarine down and look for the recorders. They try to lift them to the surface. If data are recovered, that might solve the mistery. If not, they might look for further evidence on the wreckage.
Dani