Why not just shrink the strike zone a little?
Currently, the points of reference on the batter are the knees for the bottom and the team letters on the jersey for the top (though technically it's the midpoint between belt and shoulders). These are convenient reference points. Shrinking the strikezone a bit would yield something like "two inches above the knees to 1/3rd the distance from the belt to the shoulder", which would require more explicit rather than subconscious analysis from the ump.
If the problem is that an incomplete switch to technology left us in a chimeric state where we have the worst of both worlds, why not remove one of the two? If we remove the cameras, old umpire error will move the box up; if we remove the umpires from pitch calling, the new computers will have no trouble doing a bunch of math and moving the box up.
This seems more like an incomplete implementation of an idea, rather than a fundamental flaw.
Because that will kill interest in watching the game much more thoroughly than a more accurate strike zone. Viewers like the subtle things, like that moment's pause that leaves viewers on the edge of their seat before the ump rings the batter up on a called third strike.
Plus, imperfection causes water cooler buzz much more than perfection (people LOVE complaining about missed calls).