I feel like this ADS-B discussion at political level is just a diversion , either they have been badly briefed by their staff , or they have and are deliberately chosen to raise this in public to shift the blame game somewhere else.
Because , even if the helo had ADSB out and the CRJ an "in " receiver and a CDTI display , what would have happened then ? . The crew would have spotted the Helo, maybe asked ATC what was that , and the reply of the controller would have been something like : " it is a military helicopter on route 4 , has you in sight , passing behind ." and then would you , flying the CRJ , take evasive action or go around after hearing that ? No .
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The primary cause of this collision is airspace design and normalization of deviance over the years. I hope the judges will see that when the trial comes. We should leave the military crew and their grieving families out of this.