There is absolutely no way after this year either umps will be a thing or the ABS will be a thing. The Redsox/reds game alone had 6 changed calls. Either keep the human error in the game or completely get rid of it. I don’t see any possible way they can make this work both ways. You’re gonna get a dude that challenges 3 calls in one At Bat and then when he’s right later in the game the umpire is going to hold a grudge. You can easily see how annoyed these umps are whenever they call for a challenge