Until such time as the FAA creates standards that allow supersonic aircraft to operate over the United States, civil supersonic flight shall be allowed as long

Until such time as the FAA creates standards that allow supersonic aircraft to operate over the United States, civil supersonic flight shall be allowed as long as mean cruise sonic boom directly beneath the flight track is less than 90 PLdB for daytime operations or 80 PLdB for nighttime operations. Wouldn’t this just encourage designs that create a sonic boom null zone directly below the aircraft and make it louder 10 or 20 degrees to the sides? If the proposed new standard is already impossible to meet, why not continue with the current permitting system and when quieter craft are on the horizon, make meaningful standards?