The "many" people you refer to fail to understand a simple concept that each life has a value. That value is printed on the back of the ticket or buried deep in the T&CS of an eticket. It is enshrined in international law. Things only get expensive if culpable negligence can be proven once the accident investigation is complete.
Also bear in mind that the many "experts" who grace our tvs espousing the benefits of a certain technology just happen to be stakeholders that will benefit massively from any changes by the regulators.
The reality is that aircraft do not fall out of the sky on a regular basis. In fact the mh370 and af447 hull losses are statistically infinitesimal in the grand scheme of things no matter how sad it is for all involved. It is for these reasons that in the cold light of day and after a few years have passed that very little will change in aviation as a result.