So, what is it that you want? A mandate on times for release of reports? Fair enough, I guess, but the upshot of that is a commitment from the Federal Government to provide more staff and resources to the ATSB, assuming it's a staffing / resourcing vs backlog of work issue rather than inefficiency.
A completed investigation is something to tick a box, I guess, but it's a far cry from there to prevention of similar future occurrences. Don't get me wrong, a detailed investigation properly conducted and reported is an admirable achievement, but it doesn't fix anything.
What do we actually want? How much will it cost? Does the use of airspace vs cost of providing separation services make it something the taxpayer would or should cough up for?