I know the following doesn't really remove all scope for arguments, but with the alleged precision of the camera system, a rule could be instituted that the umpire's call in-the-moment stands, unless the measured discrepancy is more than half an inch, or whatever threshold gets chosen.
Eventually fully automated ball-strike calls will happen, but as long as there's an umpire calling pitches, I see no reason to hang one dry by reversing ticky-tack distinctions.