I used to be against QuesTec and things like that. I always felt that part of the intrigue of baseball is that the strike zone varies slightly from game to game (some umpires call the high strike, some give an extra inch or two on the outside corner, and so forth). Generally, though, umpires would keep the strike zone standard within a game.
What I saw in the playoffs this year changed my mind.
The umpiring this year in the playoffs and World Series was out-of-control bad. Time and again we would see a pitch called a ball, then the exact same pitch called a strike--or a worse pitch called a strike. It's tough to fault players for swinging at such awful pitches (as Pujols did throughout October, for example) when they honestly believe it may be called a strike.
If the best way to overcome this is with robots and machines, so be it. What we saw was inexcusable, especially given that it took place during the most important month of the season.