The
wsop requires each participant to sign a Participant Release Form, which means that you consent to be shown on TV. They could easily add in a section on this release form that requires players who make the Final Table to participate in a news conference immediately after the November Nine is set, the day that the November Nine begins and then immediately following each player's elimination or, in the case of the winner, immediately after the tournament concludes.
I think it is good for poker if the people who win it consent to be interviewed. That would be another thing I would add to my list of duties as Poker Commissioner.