If no CVR or FDR then what next?
rgbrock1, to answer this question, maybe we should look back to past cases for which there was no CVR/FDR recovered ?
The outcomes/conclusions of the official investigations can be debated or challenged (with alternative scenarii/explanations being put forward that are equally convincing) even when the CVR/FDR is recovered, a reconstruction of the aircraft is enabled by a wealth of debris, and many data are available.
From the current available data (debris/autopsies), maybe the conditions of impact can be more accurately known (analysis conducted at the CEAT Toulouse) but from this, how could they figure out, with a satisfying degree of confidence, the sequence of events (crew action incl.) that lead a plane in high altitude cruise flight to the surface ?
The absence of new data would just be very sad for those who are desesperate to know how their relatives have left this world, and sad for the air safety (possibly not learning what it should).
Jeff