By Nick Selbe As the owners and players negotiate a new CBA, the looming issue of speeding up the game has not been part of the discussion. View the original article to see embedded media. As MLB and the MLBPA negotiate for the future of the sport, one looming issue that stands to threaten the game’s future has gone unmentioned during these prolonged, often contentious discussions: pace of play. Sources tell SI’s Tom Verducci that the idea of a pitch clock, along with other possible adjustments meant to speed up the game, have not been part of the two sides’s negotiations thus far. While commi…