Majors League Baseball and the Umpires union agreed on the umpires helping to develop automatic ball and strike calls:

Umpires agreed to cooperate with Major League Baseball in the development and testing of an automated ball-strike system as part of a five-year labor contract announced Saturday, two people familiar with the deal told The Associated Press. The Major League Baseball Umpires Association also agreed to cooperate and assist if Commissioner Rob Manfred decides to utilize the system at the major league level. The people spoke on condition of anonymity because those details of the deal, which is subject to ratification by both sides, had not been announced.

APNews.com

I also find this illuminating:

Several AFL prospects praised the TrackMan system for calls on the inside and outside corners but said it struggled with breaking balls low or high around the strike zone.

The strike zone has objective and subjective borders. The objective part of the strike zone, if the ball is over the plate, is likely done better by an AI observing the plate. That leave the umpire to concentrate on the more difficult subjective edges in the vertical part of the zone. Freed of an easy dimension, the umpire should get more calls right. I suspect that if a system gets implemented in the majors, the first round will be calling this objective dimension.