WHERE ARE THE SUPERSTAR SCRUM HALVES IN THE SOUTH? | Is it Harder to be a GREAT 9 Now?

Watching the Rugby Championship I was struck by the quality of the Number 9's now compared to my memories of the GREAT scrum halves down the years, most of which have come from the big Southern Hemisphere Nations. Are thew young players coming through going to be world beaters but just not there yet? Or have the law changes in rugby made the position more difficult to be great at? Or is there something else going on?