[bell-cot]

Even if you're dodging ~all the regulations which specify the current Black Boxes by adding a separate, independent system (and you'll still face a lot of regulations)...there still are three obvious impediments - (1) development costs, (2) unit costs, and (3) legal liability. Vs. the incredibly-long-odds theory that something might happen, eventually, where your new & better system would be a substantial benefit.

(BTW, my experience is that "the case could be made for X" is a polite way of saying "a valid technical argument could be made in favor of X...but in the bigger picture X is clearly the wrong theory / engineering choice / business decision".)

[ghaff]

And, given the rarity of aircraft crashes, the benefit to some small subset of the industry adopting an incrementally better system is probably pretty much nil.