As a result of the accident, the RAF decided to equip its Grobs with collision warning systems. No bad thing, but arguably OTT after a fluke accident. Very few civvy light aircraft have got them.
...my understanding is that the Coroner and the families were very much onside.
Whilst the very basic warning system envisaged (and I believe very imminent)
may have prevented this one, the majority of GA are not so-equipped. We ain't talking TCAS here - "see and avoid" will always be the best ( maybe last, often only in Class G) line of defence.
And even if it has "only" reduced the chances from one in ten million to one in twenty million, then that too is a Good Thing ...
..... after all, how many of us buy lottery tickets for a 14 mill to one chance ....