boy, who hasn't thought of that idea while watching your team's best hitter get wrung up on a called 3rd strike 6 inches off the plate....
I for one would hate to see it, though it's probably inevitable. That said, aside from the loss of jobs, because let's face it, if the home plate ump goes, why do you need ANY umps on the field, it's hard to make the case for live umps.
This goes much further, as it's hard to make the case for live humans in many jobs these days.