Is pass a law that says AT&T has to offer either POTS -OR- GPON fiber to every household. If they let AT&T get rid of the copper in exchange for GPON, they would actually be incented to build the GPON so that they could scrap the copper... which then they actually would, unlike now, where they just keep copper as they don't want to run two systems.
What they should do is not allow their laws to be written by AT&T lobbyists.