1. The opinion pieces I've read are simply being provocative. It's a fun topic. A couple or more were on a minor league experiment done a year or two ago when balls and strikes were called by a computer or whatever. But the guy who set that test up and who has been the heaviest advocate of doing this is, guess what, an entrepreneur who wants to sell his system to MLB.
2. I don't doubt the 99% to within an inch numbers, but do doubt how well the computer will match the strike zone to each and every player if only because I don't think the strike zone is all that well defined at the top and bottom.
3. In the end, however, I will still prefer the umpire making the calls because that's what he is there for. With all the mistakes umpires have made over the years, and some of them have been lulus, they have not kept baseball from being a great sport to watch and to play. Player and manager histrionics notwithstanding, to me the simple fact is that it's a ball or strike or hit or out simply because a human being, duly appointed, says it is and that's an important part of the game. In the most popular and watched and played and refereed sport in the world, football/soccer, there is just one referee on the field to make all those crucial calls. Heck, he even keeps the time and declares by himself when a half or game is over. The line judges help with offside and similar calls, but that one referee is all-powerful, even when he makes a mistake.
4. All these concessions to technology--including replays in football basketball, baseball, and, I assume hockey--are because of television. I'm grateful to TV because it does a great job of showing us the game, but I don't think it should take over sports the way it now threatens to. Replays in MLB do serve a useful purpose in that they prevent most confrontations over calls and thereby save time, but they are also a big distraction, especially if there are several in a game. I think challenges and replays in the NFL are less of a distraction because half of a game is already consumed by timeouts. Replays in basketball, NBA or NCAA, on the other hand, seem to me to be interminable and a major distraction.