Thats a tough one.. I feel bad for both the ump and the pitcher..
It would not bother me if they overturned it but what would that create? They would have to start analyzing all different kinds of calls from then on. It would never stop until they implemented an instant replay system.
If they overturn it they will have to implement instant replay on the field. Kinda of like football I guess where each coach gets a set number of challenges.
Umps have always had to make judgement calls in baseball. They would have to have very strict rules from now on if they do a new system on what you can review in instant replay.
Could you review balls and strikes, etc, etc, etc???