OK, so lets see if I've got this straight.
We need to have Mode S transponders - with height readout, (I thought that was Mode C), so that TCAS will function properly.
At the moment, if I'm down at 1500' with my transponder on and a 747 goes overhead at 25000' its TCAS will flag me as a potential target as it doesn't know that I'm 23500 feet below. Correct??
So this system is of absolutely no use to me at all and is only for the benefit of IFR traffic.
So how about getting Mr Boeing or Mr Airbus to pay for it?