It's unusual to hear an "old time" Baseball guy advocating something as non-traditional and (I guess you could say) radical as this, but Bob Brenly has been going on lately about utilizing existing technology to greater advantage, and to a greater extent than just using instant replay on boundary calls. He's been saying that maybe it's time MLB starting using QuesTec - or whatever they're calling it now - instead of continuing to let human umpires do their error-prone and inconsistent-at-best thing behind the plate. And I have to say I think I agree with him.
I have heard guys saying things like, "No umpire ever made a team lose a game", and my reaction has always been, "That is so much crap." Maybe umpires do make more good calls than bad, but those bad calls can - and frequently do - come at critical moments in a game, and result in, for example, a team that is rallying going down with a strike three call on a ball eight inches off the plate. That is simply unacceptable, and I have watched it happen to my own team at least twice this season alone.
What possible reason can be offered not to use the technology if it is available? I liken it to the electronic touch pads in competitive swimming. They don't have a fat guy walking along the edge of the pool, squinting down at the water, saying "THAT guy was first!" Baseball may not be quite so much a game of millimeters and milliseconds, but it IS a game of inches and lines and written rules, and the rule book strike zone DOES exist, despite the best efforts of the average MLB umpire to make it up as he goes along and call it as he damned well wants to.