If the CAA were to give a real (non political, rational, sensible) recommendation to something like FLARM then we would see a real take up. And largely from the traffic types who need it. The problem is that these people (CAA) are part of the 'system' and unless it has a serious price tag and industry lobbying and all the expensive things which provide the gravvy train they have no interest.
I'd buy FLARM if 40% of other aircraft were likely to have it. I have Mode C - and the only real benefit I get is easier transits - which is a bit marginal.
Mode S - a complete and utter waste of money unless if comes with TIS. Mode C - well hopefully nothing over 5750 kgs will bump into me, something of an investment. Could I get something similar to alert the gray pointy things? Unfortunately not but maybe coming.
And yet tomorrow we could all go and buy FLARM - and with a bit of promotion I'm sure many of us would. But it offers no international conferences, no expenses paid jaunts and so the people who are supposed to have a real, rational view of risk management ignore it.........