OK, how about this: the ump behind the plate has a HUD in his mask. Sensors around the outline of the plate and in each player's uniform create an image of a real-time 3-D strike zone projected onto the ump's display. When any part of the ball enters any part of the strike zone, the entire zone turns red. The ump then makes the call.
The system is calibrated at the start of each half-inning. The calibration details and the results of each pitch are recorded and available for playback after the game.
I could go for a system like that, because it's just a tool to assist the umpire.