Update (although I thought this was already announced):
MLB Reportedly to Use Computerized Strike Zone in Minor Leagues in 2020
I mentioned elsewhere that I had changed my mind about this topic and I now welcome the innovation. This:
"Umpires have come under heavy criticism of late, especially with game broadcasts superimposing strike zones on the screen so fans can see every time one misses a call."
I argued for retaining the human aspect but the trouble is, modern technology has already made that inadvisable. You cannot virtually frame the plate, replay the call on Jumbotron, and still make allowance for human judgment and error.