Umpires are one of the best things about baseball. I think more cameras in ballparks for instant replay is doing something good for the wrong reason. Indeed, baseball needs more cameras, but it's not because we need more accuracy in the calls of the game, but because we need more accuracy in the account of the game. The game should be recorded, and measured, in the most accurate and complete ways possible. That's not to say video analysis shouldn't be used to evaluate umpires' performance, but I would much prefer if video was not used to influence an umpire's decision on the field. I think there is a performance incentive in not having the video to fall back on. So yeah, I voted 'no'.