There may be many areas of contention between the players and the owners during the current, laboriously ongoing negotiations. But one of them does not seem to be the designated hitter. The players like the idea, to quote MLBTR of “15 bat-only positions that might expand the market for defensively-limited players and aging stars,” and it’s something to which the owners don’t appear to oppose enormously. So it would not surprise me if the new CBA saw it expanded to the National League. It seems likely the owners will use it as a bargaining chip to get something they want, e.