class G airspace is very rare in the US it usually only goes from ground level up to 1200 or 700 ft AGL or higher in case of the rocky mountains where radar can't reach. So ATC has little or nothing to do with class G. Only to say radar services terminated squawk VFR and then IFR a/c are responsible for their own separation.
Also there is signifcant more liberty to fly where you want in the US cf to oz, and I\'m not sure unions like AOPA would allow any further restrictions to be imposed on VFR aircraft. So I don\'t envision anything like that making it to congress....unless they use the national security arguement somehow