the average umpire is wrong on 14% of the pitches and even the best umpire is still missing more than 10% of the calls. Over the course of an entire game that is a LOT of missed calls.
According to Fangraphs, the average MLB game this season has 288 pitches. Of those pitches, batters swing 46.7% of the time meaning umpires are responsible for calling ball or strike approximately 154 times a game.
Considering 14% of balls and strikes calls are wrong, umpires are wrong 21-22 times per game on average. That's not good. Over the course of a full season, umpires are wrong more than 50,000 times. That's even worse.
Now consider that not all pitches are borderline balls and strikes. That means their error rate on close pitches is probably a lot higher than 14%.
In theory, Major League Baseball could easily use the K-Zone and PITCHf/x as a way to instantaneously judge pitches and then use the 3-dimensional view for television viewers as needed.
Umpires calling balls and strikes is a part of baseball. But until recently we didn't know just how bad they are at it. Despite recent improvement, umpires are still getting it wrong more than 50,000 times each season. That is too much, it is not going to get better, and there is a way to get the calls right.
The time is now to make the change.
http://www.businessinsider.com/major-league-baseball-umpires-balls-and-strikes-2015-9