In the interests of flight safety and to also assess the level of probity of ATSB/CASA, how feasible/ridiculous is it to have a private consortium retrieve the FDR material, given the aircraft is only around 45 metres below the surface?
You would think the present "owners" of the aircraft wouldn't have any objection to the recorders being accessed by a party other than the current owner (or ATSB) in endeavouring to establish what occurred in the cockpit that night.
From the approaching 400,000 views on this thread and given the current widespread animosity to CASA/ATSB by both individuals and aviation groups, there is possibly sufficient interest to fund such a project (even cost sharing with ATSB to minimise costs if they're serious about accident investigation).
Once any FDR information has been obtained and analysed, it may well answer most of the questions related to this accident...
Henry