Instant replay in the NFL is a great thing, because is allows fans the opportunity to go get another beer.You simply don't want greater accuracy at the expense of human judgment.
I'm curious, what is your stance on instant replay in the NFL and the line judging system in tennis?
Also, even with all the technology available, the call is still up to the judgment of the officials.
A more apt comparison to the automated strike zone would be suggesting that each player's uniform be equipped with sensors that could register whether or not the player was holding, or touched a receiver while the ball was in flight, etc. Or having a special video officiating staff that could monitor each and every player and ensure that each and every rule was enforced to the letter.
I'd rather just let them play -- bad calls, missed calls, and all.