If we're truly interested in getting calls right while not prolonging the game too extensively, this is what I'd like to see done: - All ball/strike calls are made electronically. The home plate ump's job is to determine when the ball hit the bat, the player, or the dirt (on case of dropped 3rd strikes and such) and plays at the plate and that's it. - A challenge system is implemented for fair/foul calls and in/out of the park calls similar to tennis. The result is immediately provided electronically to the umpires via one of the many screens at the park. In cases where the umpire initially calls a dead ball play (foul ball or home run) that is reversed to a live ball result (fair ball in play), the result is determined by standard rulings (reversed home run is a ground rule double, deep outfield fair ball is a ground rule double, shallow outfield fair ball is a ground rule single, etc). - Umpires still make judgment calls on tag plays, catches and base plays.