Why you keep stating that those against robot umps get excited about a missed call is beyond me. I dislike missed calls as much as the next person does, especially when it goes against my team.
Robot umps would dehumanize a large part of the game. Human emotion is a big part of the players' game. I enjoy pitchers and batters showing emotion when a call doesn't go their way. I also enjoy watching those players who don't seem to let it bother them as much as others. I enjoy watching the cat and mouse strategy between pitcher, batter, and yes, even the umpire during an at bat.
With robot umps, the pitchers and batters will become someone robotic as well. That's where the enjoyment would be lost. I can still remember Youkilis shaking his head in the dugout over a call that happened in like the second inning of the game. That's good stuff.