This has already been tried. The Camel Tour, in 1999 I believe, was an all 10-ball tour. I thought the change to 10-ball was a big "so what" and so did all the players and fans that I've discussed the matter with.
Nine ball has consistently and accurately rewarded the talents of the truly elite. Look at the champions that the WPC, the most elite nine ball event, has produced.
2001 Mika Immonen, who beat Souquet in the final
2002 Earl Strickland, who beat Bustamante in the final
2003 Thorsten Hohmann, who beat Pagulayan in the final
2004 Alex Pagulayan, who beat Pei Wei Chang in the final
2005 Chia Chang Wu, who beat Kuo in the final
2006 Ronnie Alcano, who beat Souquet in the final
Nine ball is doing just fine when it comes to determining who the most elite pool players in the world are. No need for a change.