The arguments will carry on, VP959, this is pprune after all
What will never happen is
a) mandatory transponders for powered VFR traffic in all Class G
and
b) a large % of GA owners fitting the GA TCAS systems (£10-20k and 10-20kg).
So, nothing is actually ever going to change.
Personally, I would like to see mandatory Mode C/S for all powered planes in all airspace. Then I could make the decision on whether the
cost is worthwhile. but, as I say, this will never happen.
De facto, much powered traffic already carries a transponder. But many won't switch it on, on "civil liberties" grounds. They moan about the £2500 cost of replacing the ancient Mode A with a new Mode S, while spending £7000 on their Annual...