The problem is tradition and branding. Matchroom has now acquired the rights to run the World Pool Championships (9-ball) so I suspect that we will be seeing 9-ball for a while. For the Mosconi Cup, Matchroom will do what is necessary to make the event exciting, since they can adjust the break rules. I don't think they have seriously considered 10-ball.
Sigel provided good commentary, however I agree he did talk a bit too much and frequently self- aggrandized. I guess with his reputation- one shouldn’t be surprised