To be honest, I'd support madatory Mode S transponders for all aeroplanes (& gliders) as long as we get something in return - TIS / ADS-B or whatever it is called. They can keep LARS then.....
When I rent in the USA , I always rent an aeroplane with TIS. It is crazy how many targets the eye fails to spot, even with a good lookout. TIS draws your attention and you THEN spot the traffic - it is a good thing.
Of course the chance of a collision is very small, but IF it happens, the chance of being killed is almost 100%. The people in the second aeroplane were very lucky.
I am going to buy one of the gizmo's Bose is on about to plug into my 496 in the mean time....