Interesting article on the subject with some thoughts from former and current players.
Who Will Hate Robot Umps The Most?Giants reliever Hunter Strickland thought there was no need. “If it ain’t broke, don’t fix it,” he exclaimed. “Why change the game?” There’s been an undercurrent against change in baseball, and it hasn’t necessarily served the game wrong. Jake Peavy imagined ahead to a dystopian future: “Is there going to be a point, 15 years from now, when our kids are not able to be attentive for two or three hours so we’re suddenly playing seven-inning games?”
“I think if it were done right, all players would prefer it,” said Dan Haren. “Players get frustrated with inconsistency, bias, and the way zones change from umpire to umpire.” So certain subsets of pitchers wouldn’t mind getting a fairer shake.
Josh Donaldson had one of the more intriguing perspectives on the issue. He thought hitters would hate it more at first, and then would change their tune. “The first year or so hitters aren’t going to like it,” he said earlier this year. “You’re going to get those breaking balls that are in the dirt — big 12-to-6 curveballs that hit the plate — they’re going to be strikes. You’re going to get the high fastballs up there, they’re up, but they’ll be strikes.”