Ahhh Mr Bloggs, and as I am sure you will agree that below 5000' on approach and in CTAF's is where the danger increases!
Dick, if the entire fleet of GA and RAA etc etc had mode C that would be nice for the TCAS equiped RPT/RFDS etc. However, the government would be nuts...and you would right have a good reason to complain if they set out to offer free Mode C gear to all and sundry + paid out for new enroute radars + ongoing running costs + had no cost saving for airlines.
Compare that to bring in ADSB low level, subsidise PVT ops inc RAA etc, and save in the future.
Which makes better economic sense? AND, ADSB is well proven and the 1090ES is the way of the future !
J