I think it will clutter up radar displays with SO much stuff outside CAS that any RAS/RIS services will be severely limited and downgraded. How many spurious TCAS alerts will it generate ? How many radar processors will start 'dropping' tracks as they will hit overload ?
I think it is an unecessary burden to place on GA, but when did the CAA ever take that into account ? Witness the FM Immunity additional costs. Bad for GA, and potentially cluttersome for ATC.